Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc951945bcf1285c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 16:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 681e2c873e8d9a39395c9a44bd14ad99 SHA-1: 929cafbc9f3a587eda8b2a3da50e6c8783d7b455 SHA-256: bc951945bcf1285c505b60748e1e933fa88f3859d062f611cf206aa721954715
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially compromised websites or to call a phone number. While no scripts were extracted, the PDF structure and URL patterns suggest an attempt to trick users into engaging with malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ithaca1962.com/clients/41687/File/tarufojas.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ag73apbcf39d0l6eb063087tu5/pinizonopatunebil.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/rijar.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729ab641d1---28348530635.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/91qmdn6u4nuffg9kl6chmsm0gh/jivofu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/fuleju.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/deles.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zuzazanigowaziz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gi576cuso5dc4fmlmtnkjrht6v/forolulotivu.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/49761107315.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ms6h433ouvj0fdom923tc8ktff/sukurazizibej.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc56981d3a---tuwevopeturenevazuwawaji.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160af9752e7983---69744606171.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c1f683b4---bosabopomasev.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612853be63e92---terojoguriban.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/65426648022.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c678de27f4a---zagibonaparijidujubajavi.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/84232381615.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/nidowan.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ca0d5ba3ff4f73e7954fa547e84bc01d/vibulorufajujaboxokizu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/969c4635b9fa014b36911141a7824b14/dakotureguwutamabusoziwot.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kewodifalitojikipemokidoz.pdfIn PDF document text
    • http://dothi.info/images/files/19275450545.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acabee07fa9---tosufasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=reliable+academy+mpsc+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 20672 bytes
SHA-256: 610c0ae3f4c151461ce540697f82c6b4bda389d93b7122a1378f0bccded7e824
font_02_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 10656 bytes
SHA-256: 7cc7eb104f5cb9e264fbf5a469a06b01d6df7062b8c1633e79fc82e6462ac203

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