Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8e63cf64dbe973…

MALICIOUS

PDF

77.6 KB Created: 2021-05-23 23:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce5c4a4878140df2c432caa955ec4673 SHA-1: eed8be3b30c788c934daef2cd6851e9d9031f9e7 SHA-256: aa8e63cf64dbe973f80cc0e9e11e27634f7803bf25a7220ad4b72d0e29aa4c6a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to exam preparation, likely a pretext to drive users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://adveotec.com/img/file/20832409111.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/96da59ae11f2fba4900fbc4aae847019/dumenolixupunosikedonip.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2f74b246---mazapevebemozid.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/f3u08mvacj9k1tetl61jrmihv1/wuvuvogefanazoja.pdf
    • http://naturallabs.fr/userfiles/file/34301052956.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/639c2ad2a6144582f7b4ce0e0c0f46b8/94417608312.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6778e2e6b---nalariridixunonu.pdf
    • http://short-story.ru/upload/file/52601121013.pdf
    • http://adamlegal.com/userfiles/file/70836586329.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e0f1f4b1---xirowonife.pdf
    • http://www.kickcommerce.com/userfiles/file/97874070935.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b84879d4---97798569614.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/1f2e7618abb81fdaaf0527af35cfa27d/zajaduwomu.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/supolew.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda5fb949c---18987110240.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+prepare+for+teas+6+exam
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd35.bin
1f4ad5ef7591f4a2448922724b01ab1d6457fab39b2a34db839359f89349819f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 5288 bytes
font_01_sfnt_off00010f36.bin
90ffa03a653015c8103f60dc0ca2ec0136f774b9fb328eaae5eed257165e3a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 10880 bytes

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