Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9bc6baabf764bb…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 21:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802ae29781e271c78b516b6f14e953dd SHA-1: c57558e5ac041a0e67b4eccdd026596a426930b0 SHA-256: 2c9bc6baabf764bb4cb590f12e31d669dfa7bed7dc5243b93d3fd83583a8a09e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. Several heuristics indicate the PDF contains link farms pointing to potentially compromised websites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into initiating contact, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://vistobrasil.net/uploads/file/70692462662.pdf
    • http://allamericannursing.com/userfiles/file/42528315986.pdf
    • http://coinmarketsuite.com/ckfinder/userfiles/files/buwufegovusubof.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/eabdbc0bcce665c463039197f5c43544/levozevipenokenudele.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/32744591479.pdf
    • http://abwrichmond.com/uploads/files/fitelibofafesewi.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b92e5269bde---63264480445.pdf
    • http://gld-lining.com/user_img/files/ranenit.pdf
    • https://europartner2.pl/uploads/21670829846.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b7e4f6808a74d4e37fb15832325d2a26/bekemomaza.pdf
    • http://ombs.ru/uploads/files/16072908329.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/adpr7cfjo098n186mh6dsl9vc6/lofegitulufemanadibaf.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd82164fd6---xakavagizefabixizixav.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b052a3780---19686949125.pdf
    • http://aimic.com/userfiles/file/sadur.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160747c5e5f43c---20252513555.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46ec35ed0---78734388374.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/tedipale.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/g1k5np73pcirvpnm97v06ots25/17021924660.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160792ed4a7d0d---24903313900.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/da466bae3b707ed29352fcb1d9387a5f/73703052783.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba438f6e254---kixurazovaposasusuxa.pdf
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/62258925955.pdf
    • https://sasalidayanisma.org/uploads/file/nukabujab.pdf
    • https://unosms.us/userfiles/file/55089928795.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096638869533---duxijeze.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7c19b72f---lasekamonabumo.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/72314384417.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=birth+certificate+phone+number
    • 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_off0000ec8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 16792 bytes
font_01_sfnt_off000104a5.bin
07c01b1cebc78c3b887fc8ce2182517d0d0f08b4d64202f12688ceac56430680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10824 bytes
font_02_sfnt_off00011d36.bin
f1f279707ee2b4dcdf3a694a83b7a1f702128ef488f93f999f60c51ca770a62e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 17004 bytes

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