Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bd6a53fcd23a02…

MALICIOUS

PDF

82.1 KB Created: 2021-06-07 22:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e0c5d1b90823db5ffe7681e211191b7 SHA-1: 1f1eccc696132e3f6edef2da3e10b87a07fb82fa SHA-256: 59bd6a53fcd23a02f3cd8a0fdd1d39edc8650a262374efa9b19a30dc3e29cda2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=how+to+make+a+hard+page+break+in+word+for+mac
    • https://kozhikodedeaf.org/admin/my_files/file/susanevijaza.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ad785c9d0485516e71aa163afa2ba082/xibubirutejepijijum.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734b16643f---jilazumupobom.pdf
    • http://asfalon.com/__files/file/26974918201.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01656518e---tikitedabefetuwu.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2e7f9aec1da2e01c303b78319d2a8482/zatunukiremax.pdf
    • http://irk-yoga.ru/upload/files/72747702389.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3da14d438a0e947b12c505b623cff991/20212329022.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/60af0e4191791ecab9055a9777118053/kamaforuvowesa.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b85a852a---65620088728.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609682fc5777b---24103403934.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e07tptfdfh5fdtg0adu9ip6r44/senudikamodizowovedumu.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0d84e50d32ebec7b19e96624fe6d5c8f/kofiwokatasetidozis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f9.bin
00e98f3df50f9ee994dc1a70ccc87af03c4b09c9e5342c74be3e278f67a4f392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 5404 bytes
font_01_sfnt_off00010643.bin
6716e474f3febff9bd1231a5612a126971b8335dea9ad0954e1cc5d78348d0e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 11544 bytes
font_02_sfnt_off00012cff.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 4324 bytes

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