Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1b26f2ceedade0…

MALICIOUS

PDF

73.6 KB Created: 2021-06-16 05:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6797aa5e6628fd6d383fb1d5909a0435 SHA-1: bd7b9fc40743aceebf42c7b56e3d22126af7a6da SHA-256: bc1b26f2ceedade0f099c6dddabe3e1bbed9598584e9e9d900b9e5df4d9da1e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains a reference to 'Name of group 3 on the periodic table' which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=name+of+group+3+on+the+periodic+table
    • http://nowyhotelik.pl/userfiles/file/53663677153.pdf
    • https://ph2020.org/FCKeditor/file/14872932149.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607554df4d32c---zivepafofab.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5eb9d15f---74887335315.pdf
    • http://adabaskimerkezi.com/upload/file/22606411281.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3fc5d63911f782e1fe8beb93c2a1e40d/9695212693.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e3527753---70045275973.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86856add50---43188294295.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/eec2941444867d510493c0d5dba065a2/varisunarubunago.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/50f7eb46e8616c9df564b639f331d719/71594972865.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/rl2kd3t9c2qe7vh9td48o7dto1/datanofiberepanunej.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56562d658f---71977070487.pdf
    • http://polymer-optix.de/userfiles/file/wodazimiwarepiwekobov.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d20f26064---91489009032.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_off0000e1a7.bin
26a11e9ca7e9d96ac7863884a80f2c54904cf62cb3401de9e44b833e93dbaebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 5664 bytes
font_01_sfnt_off0000f4ca.bin
70b7dbb2d3325ad664aa64bfbaf251114935c83f768a0330d6528f8d21352fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 10868 bytes

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