Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df3f705378545f5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 18:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f155a895aee0493dcfee11795712ae7c SHA-1: aa3b4408214db509bf2d9b42befe235da6212e23 SHA-256: 0df3f705378545f53f628d307ed5018c83059ff6441d84c841635add80f3025e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cv55mfgs54b6b4rh04e7p8jpnp/98580563613.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65f7a48669---57821675899.pdf
    • https://masukpt2.com/contents//files/18982920468.pdf
    • https://tonymusic.se/UserFiles/files/21363039157.pdf
    • http://generaldistco.com/images/file/zumijanowi.pdf
    • https://ascinfratech.com/clientprojects/trading/file/biranufefi.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/pabusilariz.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37083eed71---ramorobawizanagugizo.pdf
    • http://alfavit.tv/userfiles/file/woguzinaxunaroloza.pdf
    • https://emmaushuis.org/pages/86664368022.pdf
    • http://bluedevils59.com/clients/862365/File/47192602865.pdf
    • https://bem-sa.com/img/file/xiwavinekofezulitolebora.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a90e43e43d36b7c5a5f3186ed46fc2e7/xufizelile.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b19032da20---vazugusebojugodiletisat.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908f6d3bac5---78247455928.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89d559843---40048908344.pdf
    • https://srinivasagroup.com/ci/userfiles/files/ralamivexo.pdf
    • https://ntiverification.com/userfiles/file/97091150367.pdf
    • http://scandirent-new.ru/uploads/assets/file/60680840287.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6643a0d3---luvazazagexaxurewewul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=label+microscope+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_off0000cb28.bin
10d615946de41e605c9f156407d1a9c19135a6832f98233cc38072e0f50aa959
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 16732 bytes
font_01_sfnt_off0000f664.bin
ab4f803fd913f1409aedd1a2bb71203462a9a81d996b403e710cfbe0073c2784
pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10676 bytes
font_02_sfnt_off00010e98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 16792 bytes