Malicious PDF — malware analysis report

Static analysis result for SHA-256 506dc1467be749b5…

MALICIOUS

PDF

73.4 KB Created: 2021-04-27 23:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 81ff10286b730b127cc321242aa03317 SHA-1: 9603ad0db0d4aba7b2a2d162878744aec5429a20 SHA-256: 506dc1467be749b5cef767680ced918d74341a2b4dbe498373068c9c005b37b8
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fd80c44b5b0a62c7b27dbcbaf9d33e7d/tipolisovanejoraruzogame.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/glfrl6a8b1esqpni5truvc6g4v/52142478811.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9977ee108---xaliwi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082644d583b9---vojefokebebifaj.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6554469e4ee970bb93c5b0b87aab78d0/94469066551.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829ae02a23f---34268397899.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4d943954---zajexutosapefejeki.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c8abedbef71db40e46cfb3760206577/28418240326.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ioqoo9ia063nrppp595qj0hu3h/sojegijej.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/83a73d3fd401ebea81b203029c545394/47651637584.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6c05426227f8b54548f98588b1bb4c1/88180223311.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b8d28e9a---jokofu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0b6bb124d6ac5a6499fbadb667827444/bekadajewadi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/126b4231a8e81ee488bc789eab4ca0e8/jalixovolu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/84829tjdvb1158ajuug3b9hpbn/lajebelamupidujebutuwoz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768c495cc20---35954083096.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f9c85594db05f1affe28e8ab0c28cc87/12657460035.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/f00047f3b75e2bb953471eb19be44a7f/ritadajeka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hectorspruit+weather+reportPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 5040 bytes
SHA-256: f3a677195c51b1d87544b8f167760980752e6985344ca5eaf398200da0d5e3f8
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 10832 bytes
SHA-256: 56b7ae5f132d8de062a1ffa19771c5afbcb186c287431a284bd45433c11e02ad

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