Malicious PDF — malware analysis report

Static analysis result for SHA-256 7438ae25d43730f7…

MALICIOUS

PDF

116.6 KB Created: 2021-08-16 12:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e273642dc4114eaedeef42d1cfd7c0bc SHA-1: 1a539fb72dca1165ce844a674029b1f4a37cc932 SHA-256: 7438ae25d43730f7475f782805c9ea00de90ffd122be1819762c2e9c96d9f69b
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 or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wodepcb.cn/uploadfiles/files/zekesadorutejepax.pdf In PDF document text
    • http://americansemitruckparts.com/d/files/xodufixo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608757b57c951---lasugikofupuvudilel.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f632be371a---1866037064.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f1523b040b53137410b6896be12a1a3e/51574844929.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/nemonufek.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48508410654.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/78734381726.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a7197d3a5---mefowizokonevuditagokawa.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/84821984035.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/42542864822.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d078a03656---39901829141.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1cbc4c601159b92b6a3c8a5cc9dd1af6/85884915862.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a466094e68f6f6846ceb7155d7b6357/4106683048.pdfIn PDF document text
    • http://jarosi.hu/files/file/vitizotevenafuxutatupu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3c3eb2f8e48a5a283596b60d525e7999/73147969059.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/sowuvanid.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097479fc76b0---34422054039.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/dua2u8r9os9jkjvdbdufb85cim/kabazofajegopulovomoduw.pdfIn PDF document text
    • http://centrons.com/uploaded/file/63832917760e82b871b8f3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=etica+adolfo+sanchez+vazquez+resumen+capitulo+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
font_00_sfnt_off0001613e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1613E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17950 18904 bytes
SHA-256: 3548fda30d56787be2e49694e9fa0ad90cb4063630fe4d126b33782607e48de1
font_02_sfnt_off0001a935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A935 11316 bytes
SHA-256: 1edb30e0b7b1f0b96b8c158fe86d9f32b955a45c143e6a5c69061dde6ee57a31

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