Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb3ab38b65386ae…

MALICIOUS

PDF

93.2 KB Created: 2021-07-05 14:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cdc06b3882fab5d925fdfc33a333ec3 SHA-1: 8f1b4ab6a5933ee2b62cef173d57de40b45b8141 SHA-256: 6cb3ab38b65386aeecae25982e3253486ced3babde1a2c6ef77123ea5c29d700
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised sites suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e44f37572---37405264556.pdf
    • http://wienbildarchiv.com/upload_files/files/6712188993.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b138b743e---kepinasif.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379980cb11---sakolobiripin.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/mu6ajd8mj4aoqpq7dladuujij5/xedururidazubu.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c268738ecbb---tavogolodotazuj.pdf
    • https://zold-kommando.hu/files/75574990754.pdf
    • https://longhoang.vn/upload/files/zinixojene.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c1e62ab9---didubudejawirikugog.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42dcd46f32---sufuworibagexoxafinaz.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bed8f89c---5069180343.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/logakevokisojenu.pdf
    • https://augsburger-dartliga.de/uploads/file/fugovi.pdf
    • http://lezeckastenakosice.sk/upload/files/xogafekukujajofelazanive.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8b542f872f0c9e815e0c0d8cf3f82f24/94130246758.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607202a931798---pogepogon.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7df0c32e---jukagukazobi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160961b4358b5a---67305852009.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a613800fb9d---gitasolatavazetamutowi.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa82ed584d---diwarojukibube.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc20b7564b---vagajefugawurunopiposedu.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q408m9flm2f12smbb2ol7cjle3/vipurodosawa.pdf
    • http://galsabino.it/userfiles/files/8865387088.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160719e0ea8468---levirorepazavug.pdf
    • http://adance0112.com/upfile/editor/file/42379988807.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb611446d---84884468019.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=switch+case+java+8
    • 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_off000105bb.bin
4c007116b7a89bf593c252e96eaf0eba5f75f63aafd48c2f08a3dfa401bc8c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 19404 bytes
font_01_sfnt_off0001377b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 16792 bytes
font_02_sfnt_off00014f92.bin
b1d337610b3d03493486e70860a53b4c3abd0d35da52b031252b6104308be7db
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F92 10524 bytes