Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bfa09ef2de55dd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 17:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efad77c6956b625342d071b35bf21f0e SHA-1: 97f83262b20627b71ddbe770c7d1dbf48039a426 SHA-256: 59bfa09ef2de55dddbbbc3fa37f450634b4747e1afe0559b01036a0014d4f717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely a phishing attempt or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://weifong.tw/fckimages/file/kadabevivor.pdf In PDF document text
    • http://allycatering.com/userfiles/80961916018.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8vqsl6669mcv4u1q0akvsjr14e/17129618053.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/1752512019.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/rajojofenupavusewe.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/bukowesoduwu.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B84B68E152C.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a967896d---74890005209.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/lutogimejewa.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/ruwobavipamakubabe.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/60164431857.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9dcc2cfc---33550209583.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/254eofb7cb7eue5n37j9m4lr7v/41807057530.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608186735b7df---zopibidanizibukipaboj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o8t439et9t4c8p4b2m0llqu964/29994906934.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/796000edb4828979f35fe68336c2f644/fazaj.pdfIn PDF document text
    • https://ancoraeducacion.com/images/pimopavofukudejisogepenin.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/vujawasowaf.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/5130559470.pdfIn PDF document text
    • http://medi-sen.com/files/files/pamuxunivixil.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/banepitodesigebopamuno.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/verof.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/21298037867.pdfIn PDF document text
    • http://fitviewer.de/files/file/90267860968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=emmet+cheat+sheet+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 15132 bytes
SHA-256: 44c71065da8146c7e596a286bf929926c71fe22c700d105763436451c5c5efd2
font_01_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 17392 bytes
SHA-256: eaaeca20d4203d88cf4f8f422f0fdbf92a087ab3dd30afeb54a198c87daedb06

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