Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f388e30d7aff31a…

MALICIOUS

PDF

61.3 KB Created: 2021-06-23 17:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 742677b068b57fd0d1458f19d20e86d2 SHA-1: 16ac2e44f1b38c08aa958d48e55eec7d3d681783 SHA-256: 0f388e30d7aff31ad1743f6a98de59917fd0d702fc87e3e57dfae67ad0101b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters suggest a deliberate effort to create a link farm for SEO manipulation or to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

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://philabc.ru/uplcv?utm_term=john+thompson+grade+4+pdf PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788cd694aa---15923936589.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/629e59fefda7f61c1652d86d3b07cc59/46818626069.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/80530a87e6f72731b84760ebe8de6824/zorepafixamidebilu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3c325b307---vojaronotabagusawosuvo.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/68663097161.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568f3ad2c2---35452221328.pdfIn PDF document text
    • http://fittbikese.hu/files/file/ludeb.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0c7c029ef0814d89dc038b6e669a5a5/84768159535.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/9094477930.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/5302355760.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8a599984---gowukapimuxizadolivexezek.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210608_582503C9C53A9806.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pd03jl00n42ccpievt3121r11d/93853880510.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918e07706c8---fixodewinagikuvo.pdfIn PDF document text
    • http://farmina.ru/uploads/files/60024741737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23A 5500 bytes
SHA-256: 339da6bcaac669689b6fcb7bc87200dc3adb27b4d201f3448934232fb9d595e5
font_01_sfnt_off0000c4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 10252 bytes
SHA-256: 62816044930a7858af580f2ed1a0b811c4b10b130bcbd0da6a6f832312fe6d6c

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