Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fb93a9524a8aeb…

MALICIOUS

PDF

102.5 KB Created: 2021-06-29 00:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a158950e4f1b3ebbac3e80c701480432 SHA-1: 86f77a5c2148eb02aa26a81faf9f89bf98d6e825 SHA-256: 61fb93a9524a8aeb6ca01d79e0a64fae8420797a443e889b4a4a3e1b3d7ec575
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to host malicious content. The document body, though heavily obfuscated, likely contains lures related to payments or parcels, consistent with phishing and advance-fee fraud schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c171a1c4eae87a037079b3c122ad1029/67492579184.pdf
    • https://soalmatematik.com/userfiles/file/fibofuw.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/65594052947.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ep8ili7ph6gp5ttisif8q9h6b4/41560730651.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e0924197---bijagubixuzaveguside.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8b3c4b55d---98041820739.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f921c2c8ccf5722fb0dcefb1d3600ac5/zarofofewem.pdf
    • https://vildmarksjagt.dk/userfiles/file/wobexida.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4df5b2a517---79802858092.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a35i0n2ffuhatenib4okvpv7iphhr4lp/53794680574.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a776d111c08---kadekoga.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0f18a350---vifarizonekijoxusaz.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160929e00e801b---24644942674.pdf
    • https://almuhja.net/ckfinder/userfiles/files/55009455080.pdf
    • http://ashioke.com/images/library/File/pomeroroti.pdf
    • https://mfdesign.hu/files/file/mixabusolisala.pdf
    • https://vicotelecom.vn/static/source/images/file/34973938299.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/32dvevc03gqru8guss9k9c17lu/jogimagifevimotapil.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9dc8260b8ff9a6c76cfd624604c151f4/gidakesutakaduwitamaso.pdf
    • http://pobierzplik.pl/uploads/files/wegemituporavusokesor.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b248f3818---latuketegi.pdf
    • https://picinterior.com/ckfinder/userfiles/files/zodapewovakej.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63daaca212---71469241054.pdf
    • http://jhdjt.com/images/upload/File/41214600480.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0289a83e5---38088259694.pdf
    • http://nakatka.com/files/file/3322368678.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340dd0d7bc---wuzur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=operations+on+functions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d6b.bin
6f189d036b422bec23a0d3559ce713ea04be4abf33040333b822e7f3f35f9d94
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 10692 bytes
font_01_sfnt_off0001461a.bin
cef36fa05ec397002625bda5a50bc83c9c2e02e92ff39c79054d8db5324f0dae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1461A 17664 bytes
font_02_sfnt_off0001747a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1747A 16792 bytes