Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd980726e97ba1e3…

MALICIOUS

PDF

68.5 KB Created: 2021-06-01 14:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 438d8eba30431f8a7f328c8a71645c74 SHA-1: 5c9c356758f7d5eb75c9388b65a7d2ef722c123a SHA-256: cd980726e97ba1e32afbe0d4bb9072f70a2cfcfdf0aec7d5d60ab709d91f7f41
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

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 http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/816bf31ed317da124fe21dff4e69071c/76217485025.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b82300439---tizil.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/toseduzojapaxiwogodikemaz.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/rkjkemj718lc33606l0b81fmb2/vuloxe.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3fbb52829931948eb28d7a531e347ae9/dunugonati.pdf
    • http://quickvideo.nl/userfiles/file/20930341274.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8ce4bcb0c26f1b5070a6b7ebe987dc44/konegipataperu.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/os7had4h4v42p6nkmmlopa0ha3/50905781302.pdf
    • http://bioident.pl/photos_fck/file/pikififegaximut.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4759d963d30955ee8638cc592f693359/51347280116.pdf
    • http://alexlunacoach.com/img/editor/file/3829754254.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/6gv7l2lts9t7514ud2idqok6p8/9745818013.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd8260818c0b8c162635b771ce395d17/18120017574.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d854e52f28ff7cdc16813691393e45e4/garelogufopegewaruwiremuv.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/92a42938cdd225ef51dd745257369971/96655808981.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+difference+between+effective+and+ineffective+collision
    • 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_off0000ce03.bin
6bca73d3b5b44c952600cc3eedf81030a9b21971148d027fc19c24d5916988b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 5412 bytes
font_01_sfnt_off0000e084.bin
0784e119482f1a71d2339ffecbd6a64c216b22177a84dda78d3c4fb0a3c12b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10504 bytes

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