Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a80f570d08eb2d…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 23:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 75e0d7b742fe42b6eb28e52df3afdd57 SHA-1: 52a0273b335cf72c36df64e36082ffc27c7121c1 SHA-256: 81a80f570d08eb2da029ea0e0ecfaf0d258bb80fd5b8f3f2e2ecab5c3701fc90
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e47a8dabe73dc23a1689faf9a6b4978a/kisem.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2d58b1dc30853c1602302b5214741cbb/xaxumarifoziwazaje.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/e62solqb7eume2v5ier0fns9mg/faselake.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d449edbf39---bojifubixibopepogagekinov.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070700f5a79b---9998255365.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7747c5ec7b1a30c5e1204a81f63b2230/nosipegimozarisegu.pdfIn PDF document text
    • https://aashianarealty.com/file/vasek.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b18b584b3d7821cfe192f8888c1956c9/1128784728.pdfIn PDF document text
    • http://evola.it/userfiles/files/kigibivoxibarit.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3424bb76---badatonugemokizizekaxas.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ln54av2dktudh8rt6la6ktu54k/fotepi.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/262deab838ec721d8fd5846226054a75/91334554503.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0af9c772de1bcbbbe00e36fd5bfb22ec/90342778061.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d028a1c590d---11257032127.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cdd45d88---zesoviradubijataxef.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd1d4d0641---giwinijabazijavisejebuna.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0dca6ffe---75127691946.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/66841426819.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/nizojunuvopufuvipi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ou8le0j05nvame4tb9ng0oki0o/lapofixaratujisiju.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/suzaki.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8edf756b46---garexot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=timber+tax+exemption+texasPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 17180 bytes
SHA-256: a5ef508f2ce076d4b0adf48374872a2fcb274623ba667556cf514404162f87a2
font_02_sfnt_off00013399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13399 10572 bytes
SHA-256: e2ced52e1e5c738409eb859c439612627eebbf878dc1172e50566776ef6b3f36

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