Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3c6385755d2839…

MALICIOUS

PDF

92.0 KB Created: 2021-07-23 06:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9428381dc5934a79e2c3e9a1694e5480 SHA-1: 84acdf15f7df22e6cecab2f51e4a0e1098fd14d5 SHA-256: 4f3c6385755d283921b3f2d5625e64657ae62dafdae8570d8d56a64dde013301
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 WordPress sites and appear to be part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4278e4ab---47356773762.pdf In PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qhjce0phduqj78sfaphphb4s92/wazezifelip.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafae67b57c---nuxorijafalunetariwofokit.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/68563112953.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/96811179490.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc0433190---50382845137.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/op7i8d44vqimh087qla1vqcn3h/73081882028.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/zidekufunoreb.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/55e995113g7jptcd3im7lg8tm3/rigenuzen.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/xumobenasi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/29443676718.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/55750167927.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nuzupiwopab.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/52503346306.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abf55a7ce1b---68845190339.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/75394658449.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de0776648---davifumujomamove.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44bcd8a9b---fuxezasusokaz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/424535955decadb107e469c303967a26/keposob.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/194e5c908bf989ca642335a0555e6a47/sixavavagoguvokevu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f0d37d628aa42184cd04158990db03d5/59767618037.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f50ea62353c---49676501459.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24791467387.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eeca236f0---kejesarojewulavurajim.pdfIn PDF document text
    • http://clarasonic.com/upload/file/bipusesixutifaluvubi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/kubusekidonimanenoritizup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pte+exam+sample+papers+pdfPDF 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_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10448 bytes
SHA-256: e7422bb06b9b709d99eae331a51476fe0de127f5c21a7183ea5a1c44a5a60445
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16876 bytes
SHA-256: 0756a915f5a09cb0fc37c22ca2823ceb25721f5133c6532c2e144660d9efac01

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