Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01d4225f3bcc6ab…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 05:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 760376cee873a11f4de5e27c2efccbdf SHA-1: 9dfae87e8d3ce336f11b9f2d428cb6223195c384 SHA-256: a01d4225f3bcc6abef617643efab889107c0b8171547f9ad099891b1628abd98
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and URL patterns align with techniques used to obscure the true destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=ic3+gs5+exam+questions+and+answers+pdf PDF link annotation
    • http://ankaser.com/userfiles/file/wamofasifefaxeduma.pdfIn PDF document text
    • http://xtra360.net/campannas/file/rixepiwog.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a60d8484---65916833553.pdfIn PDF document text
    • http://classofjoy.com/KK/userfiles/files/88201708460.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nr6rmj87g4ttdmtmk1kpgdi3q1/lozugifel.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bfji4u39lfcch727dqtbdvlddp/26285287749.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/11562030863.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609789d5be860---19072075864.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/80970679815.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/wivubesemowadibilinowoni.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76908429053.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a6a74b605fd6a8e18c238785bfca826b/vojejelifezub.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/71161037065.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d6d47817---86951244782.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94521935e6---xapufadikere.pdfIn PDF document text
    • https://bloomeng.com/uploads/kuvivixoxuxege.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e733f6c7074d0864b9d923d185dafc7c/lanonakonulolilavelaku.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2aa7ece74---jejaxuvifok.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/18948277536.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f923ed60f4---56867601085.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/45005605323.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/lajatut.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/21966784849.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/48ca954f2418e6f2b22fcef4d12db782/bakixin.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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 17884 bytes
SHA-256: 4a2b71c9885320bd88cb310cac7c34685bae65c2832dd91d5604636edde43277
font_01_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA4 11608 bytes
SHA-256: 2f13af2ea33aa428597e786cb3724ecc5de6148b7f8472d1e10f4c57eee38a31

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