Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a88ef297f7d981…

MALICIOUS

PDF

72.2 KB Created: 2021-05-07 20:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f485310e922deb17246e6568f30c682 SHA-1: 507863360b2dd7c876044203223d3d726abc3185 SHA-256: 80a88ef297f7d981516ea600ad9a1906164ab95d4d946afe49fe3cb3ef42a9a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or 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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/964d7a9f23b5e9583459befe76396228/98548489757.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800dc032515---minamo.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf6306a77---17558803496.pdf
    • https://hondamienbac.vn/userfiles/file/mewitifetomewefaxozuwod.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f41c30a0---89556872544.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e4ce020---napujudibogufuzisokovifu.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607609c606650---besibarisuguri.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/79a97a4eb1c297170ce3eece2050991e/dovikurevogotubimudoware.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085065569f57---komukoritexosirabikiwi.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8382e8e48---gukefonitigorawevuwofu.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc93a06dbd---983137560.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2ce6df79df84bc66d00111e27084e7b9/57325707706.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5elvfd2v13mslesm9a0ft1nvd4/81588710443.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160920e2fa2186---somijovoriwowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fact+family+worksheets+division
    • 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_off0000d040.bin
9fc0ef00e26515bcb359700e03fbce183302bbdd9a43bf5ceb3613ea61a849ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 5320 bytes
font_01_sfnt_off0000e24c.bin
5bfcbfb4e8ce5210caaf72e71e2daed24dc1c3c98fd6c6c0fc16d735e5919668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 10384 bytes
font_02_sfnt_off000105e7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 4324 bytes

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