Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1c864d18d9dbfc…

MALICIOUS

PDF

82.9 KB Created: 2021-06-24 23:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 98c70f8ac5c746caa330066d8d8f5c3b SHA-1: 6aa59aa72d298ac2a79113db0ab8dc0685cb3851 SHA-256: 3c1c864d18d9dbfca4b8c4d71afbe5cdfd6211bb71ab0aff5ceb78e55531f062
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=water+pump+working+principle+pdf PDF link annotation
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/5708002288.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/dimegavenexoxo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e8380025a---43222900781.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d7442703---vedurogevupejopojaw.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/917c8620d147d6d6ee3891a5573029b9/subabejir.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6613ecc0---zukuwuxalilevedijos.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pivilujaredotigusofituz.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/20166446835.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/27296823695.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c36deda9908---zufuse.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608744ffb751a---vuxomijatiguvuligek.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ccd1c673---71085507692.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91161fc56---mazofab.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/f9b9mpiiuf1apccrbkoia3c5g1/52963398803.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/duporexakiwezutowovoko.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/xalefit.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
    • 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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 5464 bytes
SHA-256: 84da84bbdceb4d9e475e899761fe4772e077b1a31ab66ec126db323db9dc0afa
font_01_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 10796 bytes
SHA-256: 0b0c8d77a1ba378a52d93aec0f6a12ac77c54ad19806fef2f89e3ab2155c8d29
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 16184 bytes
SHA-256: fcda07541778a38204d70f6358281064753c22c4cc0735c83c667a82e7deef65

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