Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbae7e05a4bb2558…

MALICIOUS

PDF

67.6 KB Created: 2021-05-09 08:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ebcb79b426dc3ffffdf0df8d4180c7f SHA-1: 75a561413aac5110d36a6ee1f9763f5142e151da SHA-256: dbae7e05a4bb2558f34727ae6beb9075b2d2d996c526e2e90f72dadaddbf87c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body contains garbled text, but the presence of multiple URLs and the heuristic findings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607c549b188be---7214136035.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160835e041d7b6---rilus.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc4e4b315---pazojokopomuzini.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f749a8d3---22800043205.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fkprtp9s900rj2uguq2hkiqvkd/lovawufepunimevike.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb94d61ea---95954949385.pdf
    • http://akinmedikal.com/uploads/file/rokap.pdf
    • http://alnoorcity.com/userfiles/file/zotalamopebokogadodo.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2lg2ma86ctut9odd80ihdbpgn0/22183847076.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8066c1e11a6d7c506981f691663d3858/zoguzedobe.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf71ad2784---fuxebibagukidawar.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425f17ebf4---11102257490.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777566b5183---mitedazezisutoko.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/20e511212c63037dcdbf0f10b1599de7/18497556356.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608772ce19406---morefojifinawiguvubuzixok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=catch+guidelines+head+injury
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd6c.bin
68fc738852a8cc215ff2d53baabf6c55819162d03f776d668bab1442fc5b38cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 5284 bytes
font_01_sfnt_off0000df64.bin
8f31e145ae03311996786596c91d399decb5d591dd7b353312fc0740a2da0404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 10068 bytes

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