Malicious PDF — malware analysis report

Static analysis result for SHA-256 d097e8afd6486781…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 13:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 695aee57dd9c583b4d98081448442b05 SHA-1: 122430a900c72f6722557fd39fbba15a390b880a SHA-256: d097e8afd648678149860374fd699c02afe9d882bcda8f87061073cab3677ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. Although no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious content or phishing pages.

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://masini-de-ambalat.ro/images/userfiles/gefarapixu.pdf
    • https://micro-churches.net/uploads/file/38334583415.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o95rsh14bdboai4a9e0c2e07s0/puwibazipevuku.pdf
    • http://bakoca.hu/files/file/85493827020.pdf
    • http://vinmexindia.com/uploads/96984684729.pdf
    • http://lg-palette.com/upload/files/98671659737.pdf
    • http://lorichphoto.com/pictures/file/litavoruwoxividupisizutiv.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u1k3693qp27jqt772bvfkfdtq1/bedinagilokasakure.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/df60af1f2cb8e9567fa20dd534918056/8553194368.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f83d83c606bbc13b2ef3564c0d5bc4b9/donare.pdf
    • http://goldenpeak.it/userfiles/files/10053753565.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa9d3729b5e83d9e1fc56342a7126deb/11383142021.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab418e7c---97394619333.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c85bad8e4e4---39116648395.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b23862e1b---74011468133.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed5192006---somitifedaseluliwesik.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d305f1997b8341756a38d12e8d27743/8117826366.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d51f3b2b637---dipexaxataxolovoziwon.pdf
    • http://bandenplaats.nl/cmsimages/file/zumumenidimesetit.pdf
    • http://lideparts.com/userfiles/file/1622129224.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ca35c6b3033d2efac8b5b965620f8884/17391027007.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2fe6acaf0---41999471683.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092803c20010---karunovir.pdf
    • http://premium-t.info/files/files/tobositapivutijinuloxukil.pdf
    • http://fine-cottage.ru/userfiles/files/losexedojixuxebut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=touching+a+cat%27s+tail
    • 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_off0001057d.bin
f7140e4c9bb8f95fa7b090457f02efc9190a74bafa9c52709c9a4d5851dd9a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 10372 bytes
font_01_sfnt_off00011cf0.bin
428975e67cb44eac7577472dd1413ebde1a980be73ce5297f9b25d8fc711e811
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 17040 bytes
font_02_sfnt_off00014986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14986 16792 bytes