Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31357ad72c54ad9…

MALICIOUS

PDF

92.2 KB Created: 2021-07-07 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 369417b3ee3e53e0103af79778a7a218 SHA-1: fa955196978c0a5f44dae1e0693efa39cab05c58 SHA-256: e31357ad72c54ad98db220f8ce5873471df60d75437325d9689724c43231207d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external URIs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=raw+greater+sagefish+wow+classic PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4ce918dc---fagukiduvaxi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae936ee57---vajavukivulegavilunilale.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/34101326823.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9739b6be0---66883560045.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce044a342---11872123861.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/48573169584.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/85814951968.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6870a9ae23---mipadarilanexud.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/53bd4e549dec66f849c620fa05aaf4a2/zedufosabagarewogulumav.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/197d3744f22932fb4b20918e25d28d3c/xavakaguwixelanamixetataf.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/fibuzimifiripelidibuli.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a027580a14d950d1152f084f2b9dff2e/xatokodovukulusiwev.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/19654056854.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/gupefiroliwitizifakuribes.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/roruxolulov.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714185558d---99351862476.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6bf071bd6---kozitezajewunowifatase.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/67355706971.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/909259f5bafccb414d917d331a637dc5/54372288748.pdfIn PDF document text
    • http://crediramasrl.it/public/file/gevemijobifux.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160739ab4024da---vojuwipovuwawe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e8d277b75---41909646777.pdfIn PDF document text
    • http://mebco.ru/images/file/74113826211.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lilasulolemisulubelofa.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/vovas.pdfIn 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://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_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 17396 bytes
SHA-256: 2c86261ae2df9c7fe3751f327046e0a191d91b1e53d203d3235d09d8eb352775
font_01_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD6 10644 bytes
SHA-256: 69942e27c0c315d0c4b58674a2fc63cc6e8ef7c319929c80a35ecb603a4965d0