Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb755c4bbb529c33…

MALICIOUS

PDF

82.7 KB Created: 2021-06-27 14:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e67274822406ca295f70f480510bd13 SHA-1: 7f7ca73f90bee8792397919f81a2985b462dd081 SHA-256: fb755c4bbb529c33e69a03fc5974d24b252e646d6d80947ffd27caa6c2e22ca5
176 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 a callback phishing lure. It contains numerous links to potentially compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to trick users into initiating contact, likely for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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.
  • 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 http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d52a4beeac5---tavobufetafetax.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae6d01c58---vajenunobon.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/29m5pf7796d2vr3olddnbbbua2/77102320724.pdf
    • http://gpszone.hu/upload/userfiles/file/48615705457.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vvggavmr6eqov4q981m77bp574/97075943850.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace04879987---xogopetomowewusowopu.pdf
    • http://megat.pl/uploaded/fck_files/file/43712280266.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/222fb6574f3b7aeb2cd3b3e1b21939ca/90921442449.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850bdba205---jabebe.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/mixufumiwiwodikikazo.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5t8sj0tuuqp4ffs5c6qbpnlcsc/97191161428.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6de3a045af1645572b8a2b07fa22834e/91773092433.pdf
    • https://arhometutor.com/userfiles/file/97333818603.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afddebbfc9f---20265199130.pdf
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/suparome.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/95862f7ff7cae61cd8116b267bc1d062/malixatopani.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c60191d018e7d5539debd15d0ffcff7f/26238805859.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75664c8ba9---79151861806.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160970cbe6e372---94598409492.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/28shpvfk54eq6q66q9sv3875n0/judetelegebubezibelifiva.pdf
    • http://deryalvincotokurtarma.com/userfiles/file/83880061530.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/594b1d4581c5513ed4bd03a9ddf0575b/lijuwem.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a74443ea1---vixowopexanewedipasaxul.pdf
    • https://alnahamgroup.com/userfiles/file/43948418142.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3671f2869f---pitewarudujobefogutunari.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ff4beaef---sapiguvodovuno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=calling+usa+from+pakistan
    • 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_off0000dd99.bin
744ddae0a8b79d8b90fdb63c7ff9fcb4df0bcad665bc79f1b1c31293fd2dbde8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 17720 bytes
font_01_sfnt_off00010c69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 16792 bytes
font_02_sfnt_off00012480.bin
af109f4667071ad8520f01582bf2099bcc39aef9abd6925e506035703f218c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 10792 bytes

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