Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72f92a6d856a6ca…

MALICIOUS

PDF

74.5 KB Created: 2021-06-11 03:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00eee39e81756515d0c45ebeea0e1fd3 SHA-1: 218c3a4ba0aa9dd97bb2afe58f2eae726a0cb3cf SHA-256: a72f92a6d856a6ca8f8cc5a6eb5cac5e7fd7ff0862c8978a69e85be45603a50a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a malicious PDF detected by ClamAV and ML classifiers. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=dnd+5e+interactive+character+sheet
    • https://hometeamcorp.com/images/usr/pemanure.pdf
    • https://aymfly.com/aym_image/files/42282088867.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/84790234078.pdf
    • https://adepotcustom.com/UploadFiles/file/20210430210325188.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/dcc9bcc8b92d9d9f17c239585e0e3afa/94243789036.pdf
    • http://ferrogep99.hu/static/media/file/pasizunivuza.pdf
    • http://trendymamy.pl/userfiles/file/tesifukagumodub.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b906d2914---67812976536.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a50ab61c6f34fcac1cceafec6885aaf2/pibajaregaxaxokab.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1082b50242---xabawuki.pdf
    • https://aonetreks.com/uploads/file/3477890755.pdf
    • http://altaprecision.com/userfiles/file/ninorafovokosonetod.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b97eb6e06c72a425d61a129ca7da0a2/73989511895.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5a638fcd1db2775488cb67923f4bb270/jufavakisawadosipenovuw.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/da20ca6c83e58b53f73acd6f528c8f7f/bisirawuga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cf.bin
3ceea40f4729ee0ee79bca988fd06dcd3dded436b68fa8dc51715b0f1713a50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 5180 bytes
font_01_sfnt_off0000f779.bin
0abf019ece919b7bd74d6b3f7978b7cf63a9b37dd74c4b6dd61addbbf3e467e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 11052 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.