Malicious PDF — malware analysis report

Static analysis result for SHA-256 315fba9e92eaa44b…

MALICIOUS

PDF

93.0 KB Created: 2021-07-29 17:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7e39974291e97b49071b22179a049b2 SHA-1: 2a229ecfb52282da25799618ff04c0d29b93c940 SHA-256: 315fba9e92eaa44bd481347b37adc29aa55a1dd9c05626fe6cf682a70db74f25
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external sites, many of which appear to be compromised WordPress installations hosting PDF files. The presence of a 'password-protected archive lure' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to evade gateway security. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f624616842---rowokogupolipalizubavenu.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/prp23eja132u6aor5p7u2fd426/27182503662.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1b663de7---mezeradepidusi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5fe09c39---nubuxupufiv.pdfIn PDF document text
    • http://hasyo.net/files/file/11308952296.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zejebogaxamulenunun.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/875ab911f428a41335772e1dc04220cc/zobesugizerad.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0b5ff29cf---bukalakorigakuzaf.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63dbd16c76---wipebuwesuvev.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/4748266084.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/terobalizi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a5cc8afa---fojefixiwaxujemuxenakufu.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/wixuzuvuw.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/40763284b23a3ea5909e5e3b57e165a0/najod.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/45538666413.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d02b592026---suxegal.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210717/file/serojanefuduperebozidag.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a18391cbc0c---92323912954.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5b39ab75---kekupufijolaw.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/aebea55b5701115500306629066f7bf6/80574988113.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/67798838140.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/78939010026.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ef871bf1---69921812627.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d203a6735b6---nupafibejokarufifukuked.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a322c958871---47785000949.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5d7c0019206ffd2ea534a5c0336086d4/40228452732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=canon+cp800+driver+for+mac+mojavePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 19876 bytes
SHA-256: 8df318379b457f9e2d87319aec82495d66b82249f6004d84d13ef59425ec075a
font_02_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 11028 bytes
SHA-256: d3cdbe75adcbeb0458705ec805ec1fb076f76e929f460cf008e0a1ae95fd6936
font_03_sfnt_off0001591e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591E 2688 bytes
SHA-256: a2ac081e08affb0ecf0a940f0eec8b4be73ee6624f5ae6ef3b741cdea718dd26

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