Malicious PDF — malware analysis report

Static analysis result for SHA-256 231c2d493f80b1b5…

MALICIOUS

PDF

73.6 KB Created: 2021-06-09 04:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bcd0f70461e73e8857013eb8a15141b SHA-1: 5650c4dcf79a247b0f57cd98704fc1f9bab516c1 SHA-256: 231c2d493f80b1b5e5525680fa057f546f9f3363a7788f245c997ce5137cfc5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://nomylo.ru/uplcv?utm_term=4th+grade+clock+worksheets
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zemizenekirowemesibokav.pdf
    • https://speakingparrot.com/upload/ckfinder/files/25738333085.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tn5a9op0v6ckpnvemdjr2898c2/wekuzozurolunoni.pdf
    • http://turagent007.ru/userfiles/file/11709874353.pdf
    • http://aucoindeshalles.fr/menu/file/zerotipifupujaterofo.pdf
    • http://adamlegal.com/userfiles/file/71779933057.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/dufalodobad.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e31eef01a---2669926707.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f10e3be83---vesinisenoluxepoj.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/af7ed943569b6fd33229b4b5c6b1ada7/jiroliruniwib.pdf
    • http://fittbike.hu/files/file/86878330732.pdf
    • http://highendschmiede.de/highendfiles/file/fimig.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee08643f1---mogasumuv.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/eb4960621ef87ef51df7504b14269adf/88621663089.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_off0000d69b.bin
4915365da419bbb077cdf2bc2904eba210583eb2a97ca004c05744c52bcdffca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 4984 bytes
font_01_sfnt_off0000e7b6.bin
30fdbfcfe9fac5af6f87934653bde6ead8f871f3abbdd9686602e06e59e35205		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 10548 bytes
font_02_sfnt_off00010bc9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 4324 bytes

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