Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20f65afcaba642a…

MALICIOUS

PDF

83.2 KB Created: 2021-08-04 08:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ec5908e24f0410d621d8c19c7ba5382 SHA-1: 2ce480ad7e61b06c5c3cabc54b9505ecfbb7ca64 SHA-256: c20f65afcaba642aeb98aa1a981af349249625176c776c7345366d2935aa6b8e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, containing numerous URLs pointing to compromised websites. The ML classifier strongly indicates maliciousness, and the heuristics identify it as a link farm on disposable or compromised hosting. While no scripts were directly extracted, the nature of link farms suggests an intent to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 4

  • 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
  • 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://cpsguffanti.com/uploads/file/11218728625.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cc3f67a063d1ed6b961df8aade9f7919/24687028958.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/vunivopajujinuxofamofol.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e93e33394057f242ebbd036c031a59b3/67712663373.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fce75a76915af890756a74676d82f85f/nomevuwigogiwoni.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca33338f2---91495424454.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/janofomiroxofog.pdfIn PDF document text
    • https://tl-systems.hu/files/files/piduxiberojirod.pdfIn PDF document text
    • http://yuha.be/_files/file/teduxedonalubumudebubeb.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/34067868726.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/soxadikaz.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/24639207065.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/15105883383.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/newapor.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/eadfd3a4724bdf91baa735dd41912559/momoluputakofojogizeguru.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2cf15abce---sasavesixexame.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d90bd93f9fc779d9d781be1a7027438f/98827052824.pdfIn PDF document text
    • http://hanleyresources.com/images/kojevevevarudeb.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ef6e92433---nizonadugova.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/57239519346.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a86c91c75---65031138396.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/434da9916730d4ba84701808861e55ad/doloropizegokorimibutivaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=electronic+media+managementPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 10528 bytes
SHA-256: d5857c14afc61b4ba8942206a6327b20837d3ed1fc0b6a63d0078f35cc80760a

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