Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f22d3045d4913c…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 12:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 293aa3217a5ac0f3445fe0a997f8763b SHA-1: 3c14d0532931a45c6765fcd542c52e199491e313 SHA-256: 91f22d3045d4913c9a4168adeae28cee55a5d06b599f0d3f953e889ae6e9e5c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious content strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6433c864ff---60529917780.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/542alsgq4kcf7jjtdoq4406uiv/nurokugekum.pdfIn PDF document text
    • http://e-district.org/userfiles/file/68696101608.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f597ebee86---jilawikige.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed603cbc7b---nuloke.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6a7b2438c9308374ea2ca117ec5ac96/38836164559.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/99045674889.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cfc99217---778126733.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f4877c67c5245dc6da6e2de7d781c7ef/70664393298.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/11790741992.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/61153701694.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8r0lg24sutjc277g5glign0mln/94357105477.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/jaladepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chi+square+by+handPDF 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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 18272 bytes
SHA-256: a1648f9c71accd9f3aeee888ba962eb054d57eb7aeda922dd35a2d4e9521ef90
font_01_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 10612 bytes
SHA-256: 786a04b01c90ae7751c91b2af05ebb329f7eab93a4794daa616ecc3d867ba190
font_02_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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