Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a28cedfb9efb7…

MALICIOUS

PDF

100.0 KB Created: 2021-07-22 06:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55b1446d3b151807c76cd3220607571c SHA-1: a7d08e2d6d72dbbc6e36df5b911c19f09dd0eced SHA-256: 3f8a28cedfb9efb7f9aabc13dc1f1544a7b7bd2e5f2f65141bb1149f0fe098d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/612ce3847b163821b3681612fd3af6f2/7087297795.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cafa1272e---6088678105.pdf
    • http://akhsmombasa.com/clients/861898/File/3071736265.pdf
    • https://pavillonwohlen.ch/userfiles/files/kanav.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f06b74b7---92607203182.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9103c642d---wugovepudisiluzawepewabi.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69611f06d---degukatemepuzerimexabafe.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb8011f3e1---89803516892.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/15850559156.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/nepugutinegowabinika.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/abeb92500d8ba4afefc29925fd473d0e/89346399223.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/474b52446907a0edf56bac6627fbc903/47727508505.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb55042bbd---govuzotivasiteravolukib.pdf
    • http://kojeneckezbozi.eu/userfiles/file/vunoluxobawidigasepizi.pdf
    • https://kebecelectrique.com/upload/editor/file/29337271076.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0a068f595692652ad5ca1c82cf434ef/muwolosiwib.pdf
    • https://villamishkan.com/310renonew/front/images/files/bevinafar.pdf
    • http://changrung.com/ckfinder/userfiles/files/3909248385.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u2292dn4g00tntduq4mhbqf11m/27226196278.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14ac9079e5---88061264031.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9cf6ea09a41602cc78c49ead067a7528/jezigod.pdf
    • http://www.sport-konyv.hu/userfiles/file/66820970157.pdf
    • http://majortaylorride.info/images/uploaded/file/lexaw.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160892fb250a22---meviwuzanizogetanoxodoru.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da5589c77be---tituwarunol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bsava+manual+of+backyard+poultry+medicine+and+surgery+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f0.bin
f6531fb004197fe0da0c74570ecdd60d0eb9e1eda77e4ff7be668a8e366d200f
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 11528 bytes
font_01_sfnt_off000131e2.bin
d03db559901a3ecff2bbd1a29d1ed226e24ce3a283915f7823ab8873681e7b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 1676 bytes
font_02_sfnt_off000139d6.bin
ae12bb8e8d73521999bb6dfc8989edc9d8544f3457bcffeab292ce635c2c2a77
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 18508 bytes
font_03_sfnt_off0001692d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1692D 16792 bytes