Malicious PDF — malware analysis report

Static analysis result for SHA-256 58503cf7944677f6…

MALICIOUS

PDF

95.7 KB Created: 2021-07-01 19:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eac2e8c03289536bc12788a516efecd2 SHA-1: 88fbe74bc01dc8654bc2387045577a327fab9f1c SHA-256: 58503cf7944677f62fe71910162aea83830be72c9166776ed2b1f685351e7773
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure point towards a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=sims+4+relationship+cheat+xbox+one
    • http://edwardlankin.com/clients/86087/File/88721502570.pdf
    • https://anukulagrotech.com/userfiles/file/pajobewofa.pdf
    • http://domholidays.com/userfiles/file/juruf.pdf
    • http://canigrup.com/userfiles/file/33025973230.pdf
    • http://anandtouristcorporation.com/uploads/49030895413.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e7f1f6bb18478a027cb0f57fb9752752/34637932821.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53885135050.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a684eb74afcf64a5fd81cf3720266f79/59659740819.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8b1cf8e5---ditezukefomikomosasisem.pdf
    • http://velo.hu/UserFiles//file/zifas.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/63j01li0qc3ng29lhtjm1p2im2/74141428253.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/g1v9sldmo2q2ldtnr4aje2snah/43658692563.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5241cf4d12eb8d742a0882bd3cbc85f9/86281902923.pdf
    • http://global-insurance-broker.de/downloads/viguvufojadupazizuweme.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f371f498fb48f5ed91ef5226270b4823/jepuj.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6c9b27b8d2dd72386d8a30908c5dbc52/77608277465.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/92f48977b048f387c53d3c70828cfc9f/64597373179.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27ce7ebe00---dezosukokegafarod.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/lk5dr5go9h3qaie7ecv6apf2o1/73495110285.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qrggh5k5rbrmfur8jk2sclhcr7/10826322173.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa11321c0---feduduworagaxefowibakaken.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b29b4aca7ecb25215f610302fd50a287/rarug.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_off00011089.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
font_01_sfnt_off000128a0.bin
46618cd2b8f9904740d74172a30acbca1e7a79018e77ceb2f5f1c8e01752a9b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 11032 bytes
font_02_sfnt_off000141e2.bin
3a2309bfdc1e699f92dadde26bdec165d2b127fbeb6c798bfff4421a2ec77a68
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 18060 bytes