Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4ab3d12649a726…

MALICIOUS

PDF

92.2 KB Created: 2021-07-03 03:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc74c8324aa39e31f44723e7cdd3b2c3 SHA-1: 98398b58361dca99006db12fb94123878784c437 SHA-256: ac4ab3d12649a7262df1f8129b6f56bd48765982e3c875b71829c2844b76f916
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://crewmak.ru/uplcv?utm_term=good+electives+for+business+majors PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/j485qh7akii2ajq4dhqm6pno53/sorumewesuzezomelevi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9edd54145dee502e2c632f39a7bf6192/65909358842.pdfIn PDF document text
    • http://northcity.rs/slike/files/kewibojejinakamebibemag.pdfIn PDF document text
    • http://cecev.com/stockages/files/doxamedotabuzekumunebu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tefibikerubarifafefuk.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a667dc7b611---9988773270.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877478bd1cf---67199145622.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddd7cf612---10410923620.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/23227314850.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160733f2181581---lavavepisulokawinipufivid.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c66d4b71---33797070040.pdfIn PDF document text
    • http://17njl.com/userfiles/files/71838878882.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ada4357e95e9ac9b681b2e3ac3a04651/26996858764.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/71594803872.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6953d8ec5---nolidukupupaxetegoz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/59767e20ffe2635684c62e2e1a5b947b/zagupitudarezowapupenutu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8ac60199---gazenosaziguvidefe.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/68273579732.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/94595120532.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a507e03e---rurazi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce201863b---relupagasitegaxaxeguxew.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/89491872322.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ac987e3d6f2efb87bfb38978c8c99910/nuniradugizurobereju.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bitorasezarabaviluguxamaj.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4ki6rasolj2haq2oh2pooh90l4/fajabugazinegumiw.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/89594843528.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 11112 bytes
SHA-256: b08c3e93575f44c83f9dbe7f912508e5029a32d3c29aa476a99fa9a6383ef117
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 17048 bytes
SHA-256: 8af5c029018fd848baf471d5efd83a114094fd62a7dc9449895dc31a5d217381
font_02_sfnt_off00014981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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