Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdf77c1b1b4858a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 22:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a5d25ef4df64140eecd880bc34a9991 SHA-1: bd618f0e3893a70052477402ca5a9266d2c3d1f7 SHA-256: bbdf77c1b1b4858acf391ed511cd67a75a568b7aefb102f90b6b38b8c73aa0ba
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/91591ff10ed8637ac7069f52909df9bb/tojowif.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a8c16ae658fa8ebb1016dde6562eba65/94580751341.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3955bedf4b5ee3d0bd67e89d84f257d2/purikewa.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/p9i2ir2cufq655lnlk0ch794pu/27983517075.pdf
    • https://recapress.com/ckfinder/userfiles/files/17241398703.pdf
    • http://omg.su/upload/File/popubatafozubobasupo.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hhs02firienih4b924u92k51q3/pajigajiwamijapufet.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9515137f---nujuxuwixusovo.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab88b4cfc---nexafewokide.pdf
    • http://work4shop.cz/userfiles/file/60201131462.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4992dd126---kavokovevazidesewunujipoj.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/97951341963.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/504fc33b52abf94c61f8db219732903c/winizekofametulano.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/13f737330da274ef59d1007e0725dfcb/89097972784.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bc008e4f---75807164960.pdf
    • https://prosperitas.be/data/assets/file/dajulamigigawelosutiven.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/aa0362b5bb4c97b0113cc8685566b542/webiziwiranaduz.pdf
    • http://austral-immo.com/userfiles/files/xozoba.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qejqj7s8vrtlado35jtridn56h/1960156944.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3c58b74d---38962719291.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/83686991940.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfff695da2---nufavafumin.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/pfblfj1o703bo58bmsq0e676ue/xatovog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=to+strive+meaning
    • 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_off0000ecf0.bin
ec2580940badc57e0d0d95dd401e4593093417b43b134bba1700322cbeff5430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10436 bytes
font_01_sfnt_off000104a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 16792 bytes
font_02_sfnt_off00011cb8.bin
66b1a1c1027e3cac2bb4a7ba14508052bd7537d7219a6765eb7121fa7687dc8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 16708 bytes

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