Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0d84a868f526ee…

MALICIOUS

PDF

76.9 KB Created: 2021-05-30 12:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc3bd212e739b7530d8b018155d2ff14 SHA-1: 2fc54f17b926772280470839401e4f5e50a4e7cc SHA-256: aa0d84a868f526ee21d845e5a8f6bcc73342dc2f5619b60ee78336ec387a131a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter indicates a potential phishing lure related to an agribusiness management book.

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://medvor.ru/uplcv?utm_term=principles+of+agribusiness+management+5th+edition+pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/40273917688.pdf
    • https://mfdesign.hu/files/file/tejusotukitarawubosojowa.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sprlkiqvrj5v4uitq4fiqkig0p/letedikobubabiwalalubik.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/382533f3aa74a72ca634f562159a8713/wibuwarifonodid.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b75449b4---mebukavezapoliretupag.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f54072c1---87299489914.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ce5aaa4c1c063c91991375f4da05831e/54233563864.pdf
    • http://scheidenschiedam.nl/uploads//file/66662446615.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719bbc7a8ec---niwufasubuxewijonosazaw.pdf
    • http://healthywithhart.com/res/file/8359888873.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8lprimda5fdi6k5hag3nspdmkg/zobaviduxidi.pdf
    • http://adabaskimerkezi.com/upload/file/84946710154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://e1pl2.nazwa.pl/busy/fotki/file/wugazif.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee82.bin
1d90a0c80035927ec875af8223609d609020ebdc0a2b898b8f677ced727b15d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 5832 bytes
font_01_sfnt_off0001022e.bin
86ef08028b65d782bf11b591093ef3a40072553d08f8736723646a0e8ece3334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 10668 bytes

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