Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfc7fd4aed5e4d0…

MALICIOUS

PDF

77.0 KB Created: 2021-06-16 07:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2064a239c50813e49e48dd5123e7b1c2 SHA-1: 75da16f6e0226e213ed0baaf7f76450d5c10ac73 SHA-256: adfc7fd4aed5e4d006ba5a7af40042722723e64b775809e3b1949de45f2c6626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=drama+boss+and+me+sub+indo
    • http://barudan.hk/UploadFile/file/20210615220109815.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ohp8p0h3fg691ji3enu0aik0n1/sixijefotobafokalurazifis.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160876e15ba3ca---vajas.pdf
    • http://hgbs.de/userfiles/file/802297415.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/20574656449.pdf
    • https://pharmnet.cz/ckfiles/files/files/tunijede.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/19l2oqh9sqhc1ai0tj25erqn6p/nujon.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2c5ad820e0459babbc0c16411e9e3b90/kefexiloserila.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e012d4b2.pdf
    • https://airflow-skateboards.com/upload/file/nagipadimarawe.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeace81e6---levifotadutuzeze.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab0761a3b---99561336343.pdf
    • http://jrmhandling.nl/upload/file/tafukewif.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baec0349507---16346608148.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/il0339vgorhqlosnqaoc5aas93/tuwobivubawuxename.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9090f0d29---bojokedibajupimizozitu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d937.bin
f2cd8501c753198aaf0b3cbaddf361c905eed43c16aa93e4e47712cf49c685ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 6952 bytes
font_01_sfnt_off0000f097.bin
bf138e89b382c66bfea3145c21fc7406e9f6ce33f4d74f3de3cac9c432e9ebc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 5080 bytes
font_02_sfnt_off000101c1.bin
e53173d5141dae7853203a3313eab812fbffdb4af8050da341b8665d9bc5b078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10556 bytes

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