Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf30534f3af5739…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 15:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20801ec772dcaa2409c874c65150d5c4 SHA-1: c9d0677735af23dac2c2e65aa1efa6fdf1cde3b1 SHA-256: bbf30534f3af5739cfda2a3cb5cdfaacca3f9da67e17a0141513a7187fc04bf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://huntic.ru/uplcv?utm_term=angel+wings+symbol+copy+and+paste PDF link annotation
    • http://renovfab-menuiserie.com/userfiles/file/panitaputusumewuxopedupa.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/kewijobuguxufisazasunor.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/80556616826.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947c6560b8---gatixevenajarunupepiwi.pdfIn PDF document text
    • http://proxima-online.it/public/file/lanufetalezegolewesij.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/jokefosuvividodawuwev.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/99302574899.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/9288799828.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/govulixukomodulubago.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161398c64049a7---26795658350.pdfIn PDF document text
    • https://atrax.hr/files/gefixizaroponepilolotiki.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/polozudajedamezibog.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/6152474932.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/darekizenefovor.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464ce8a9a7---51687477022.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/26015038601.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/10074339794.pdfIn PDF document text
    • https://samowar.ch/upload/file/73336589337.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/xudugesa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/30ac7ff5bbb68227b1fc590271c0ac8a/jezumutapafusiwegudezaro.pdfIn PDF document text
    • https://subded.org/userfiles/file/31763698584.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/10330122191.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/zoresoraremu.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/55748170430.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/kelodizuxebefumupofufep.pdfIn PDF document text
    • 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_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 21548 bytes
SHA-256: b137fcea943ab3d40d2cc1f7dca584dea060a84bdb4b277630457ce3846c674a
font_03_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 11076 bytes
SHA-256: d6cb5a41bb21fc804c1ec64e759db61eefc676a06679b64814399a7e1f1c7b7f

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