Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40b26db01b2ed1d…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 16:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6aa11bb534a7650f23f71ffee6547caa SHA-1: 923d773eb665179bbbcc4d82c7fd7b6f281c154e SHA-256: f40b26db01b2ed1dda6cfa8bd5b9974412a566f1f0a03057b32cd90f5ecb9aec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf81352f8e---93750649430.pdf In PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wuzudatuxenodajuvov.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/00f32e6b4f2ff6bfba157cfbacdf3f3c/karekopoki.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105140958107409.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1975115b5c447cf19bff76a823e49138/59197969824.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/ditunowolakosepof.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/20a91394f5315446224bb01b5f1721da/51878038129.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a8760e8afdded33a67e13366c0857355/zififevakugimefel.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29c4d193d---nuradipor.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160abf741577bc---73051009014.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081aad660c78---91592278732.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/7406430957.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f94oakj8kp7bpp0t58m9ag2udc/nukenujejirodal.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a1c07a35---60772639794.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5b764f7c---63413621454.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed1d36801---54560497822.pdfIn PDF document text
    • http://skncn.com/u/files/82385346495.pdfIn PDF document text
    • https://retta-bg.com/userfiles/xakamodurisajegofo.pdfIn PDF document text
    • http://fedime.org/imagenes/xogamudali.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091197a36523---30455403921.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/jopaw.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4a16188c---xijatomonimorubosez.pdfIn PDF document text
    • https://medtek.vn/storage/file/devubekuzukox.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/xorumufow.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/dirozuzuritutifetamotaso.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4121b6d6b---96982607054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=star+and+marco+kiss+episode+season+4PDF 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
stream_004_off00012138.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12138 17148 bytes
SHA-256: a651408818cbb8b23f00a14bf5c958fbdc6e26c5938d3f2b49117863e7c2368f
font_00_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 10872 bytes
SHA-256: 87c627e2105b98cacde0190ae7bec478cd69e7dd569415bbc49738eb82186c25
font_01_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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