Malicious PDF — malware analysis report

Static analysis result for SHA-256 78634debd0461aaa…

MALICIOUS

PDF

77.3 KB Created: 2021-06-15 10:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7c2fe3439632b35580c4c39f7aaffe9c SHA-1: 92f4fd69a29ddddeadcac43f5af5aadc5e828749 SHA-256: 78634debd0461aaa3a4ce505e92a6bc4540ef61c906bf13cd915040c458f470d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to popular media content, likely intended to trick users into visiting malicious sites. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

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://pistant.ru/uplcv?utm_term=watch+attack+on+titan+season+1+dub PDF link annotation
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/okmdnrlv6onq6q3da44lvbhrcc/50490673505.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ad98f918571be15ed5b4816bf616dc6c/30975484953.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251a341f03---wexijaxunepigelik.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fawexiralikelisolizu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/dudte45ba06bl9se6qnc0em247/57042651901.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/41075635210.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/83108320092.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/99202265762.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/crnvsq61opeghbpr91u796nv0o/14877217196.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a485f40f33b---14316328491.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429151516549941.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f22ba5b3---sagugovowuzenasana.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qqqegenfhmglurblba2hfucm01/41020710500.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4268e5e2f8---talufon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 5168 bytes
SHA-256: da7088a8ad387679a8c55c54889e57c6771562bebec0806d8d8645cebb7df1f6
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 11696 bytes
SHA-256: 4c531a542b5cd990d44081a7f282d27870982d19f52b0e67193355bf20ad8e5b