Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06bf4a20bcf2ce8…

MALICIOUS

PDF

137.8 KB Created: 2021-06-19 02:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 03919d521935285ac0de3304279c3239 SHA-1: dbcdbd6b9bf3fd13c12a78752f576fa90d92a46a SHA-256: a06bf4a20bcf2ce87f2a8fab205603601a5746a7f5f7f511328cbae71ac0feac
156 Risk Score

Malware Insights

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

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 for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=yusuke+kitagawa+persona+5+confidant PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ed139ea23f2480ba75dd461b9651b0fd/lufevuj.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/48759447503.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/saripojujomazukapolupufil.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54129192a7---53261100114.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/mrv5b2a3p658babulhi1ffhb02/87191575783.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xirapezurezimibavipi.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/73714950652.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/d6desf791gpoa5njvmsbp8do9u/mejorojokufag.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db21875a04---94330658383.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/19158622928.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gn96q9n1g03e5t24v0bih44m3/zebilebujakujotetepeseb.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/lisibemov.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e3482e6e617e1560692875fda2da6227/70795348964.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ea89eb0bb90647efba29a1a58af1f027/85471672864.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/67231471192.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/8qojna87gt54acf1qqa4iivt13/45835173390.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/58fd3efbc18c6ef47e5a9f63527d03ca/texakekadevivimebikizeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15356 44532 bytes
SHA-256: 9f17a7b45385a1307f382839ec0db12b4c51f42b88b901c9bb8835df53e26a10
font_01_sfnt_off0001dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD7D 5532 bytes
SHA-256: 5fcc5e8a84e8a4271a33dae66ee60f692792dce78c432abb41e69c19a8b462b8
font_02_sfnt_off0001f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F083 12936 bytes
SHA-256: 2ffcf00dd7bd6ab87a61926fa6db51667d9a116bb9ebbf85aed3f8c08269888e