Malicious PDF — malware analysis report

Static analysis result for SHA-256 033cce92584b3dd3…

MALICIOUS

PDF

76.1 KB Created: 2021-06-29 23:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8907673965146a49977c7bee4fb27747 SHA-1: b170ddbb5e4b2f8404726113c726dfacd2609933 SHA-256: 033cce92584b3dd350411ae5e8f31de53d80831531c51e6a34295a2c53d9f8a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=watch+tangled+movie+online+free
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m1sjsrh8f76jli7ra2mptdqgb1/zamoleda.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e816c2d801---fulowalokedoruxonojano.pdf
    • http://backupcenters.com/userfiles/file/10354290926.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7a831d0ff---63787926251.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512000429550641.pdf
    • http://jjmcp.jp/userfiles/Image/file/levefuzamavoleba.pdf
    • https://europartner2.pl/uploads/80898273595.pdf
    • http://bafiti.com/sklep/userfiles/file/godanegosibane.pdf
    • https://autosaloncenter.com/uploads/file/vazugulowavapodevurosa.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfa22be7d9---72604096680.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e63ba67ff0c6c9baf50c8586feaf40c6/32624383429.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf53e95ab4---52391103987.pdf
    • https://paklya.su/design/img/upload/file/petifowuki.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/umcj5f01a8n705454o2ghbvb71/49434049665.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106030633299588.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b227fi9929u0vr4613crmekrom/67838854930.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/19930de608e1fdc107b447710be39edf/sikunuratovakedefasakotex.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a334e213e---5516274787.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/35498449525.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/514ac590f152f63ba4f07fc5fc204af6/fegekemenezonejuz.pdf
    • http://humanitool.ru/userfiles/file/17227437064.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d0bb60449f8a9bd4397420ce206478c6/62740132630.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6a301dad---tafawufofuto.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 16792 bytes
font_01_sfnt_off0000df0d.bin
788242719c952b2941574c90c42d692d27a8ccc491a4bfb0999371929b51f6d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16976 bytes
font_02_sfnt_off00010ac0.bin
692931bdbe733fe3767e93ef85515542899ffc1f7ab9a55efd06b223efeba9ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 10816 bytes