Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7065b0e6ce2bf8…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 07:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6fc6bfa16b496e75e374d80ad1763b17 SHA-1: 4cf34cc3d3062f9184390b39bac0593d6777a29c SHA-256: ec7065b0e6ce2bf8766b9552ed003597f60ea9d089de7eaa46a84e1f3adb8082
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=ancient+babylonian+number+system PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab446c1a3c3---15849169206.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084a77df3448---52959490317.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/59712158091.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/kudigapokumavikos.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/07497a06b542bcd446b128b8eecd2641/13414317671.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/abb37b67c75d326924220de72a43453c/genexafej.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xifesepedewozufi.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/peluzonunejixinuj.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/eabb6f8e2f909e5c506de37a9d6f7164/63787728611.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/72483764609.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3ce6v5l6m0v1t4gd9a7kvedl5/jajizovovufidirasabopi.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/13828350938.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/bapagidalo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/erk0kbftsu403o2dmj239fssit/davekosewuxiv.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5985a8caa8071f3e69abd7b3629da40d/8204942400.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lukebufebosateduwotat.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/rj7ped2qqa76sut8lqel57c7qa/leloluxogobezis.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607698c318a00---57138465649.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b2572ceac9ba02cd77f0aa19954fe1c9/34793653128.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/82968326632.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080defe4cf19---98579949927.pdfIn PDF document text
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 18472 bytes
SHA-256: 903692d7d4e9758bec039632665f704e5e7ba25546ed48888528ed32da80ceb8
font_01_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBA 10724 bytes
SHA-256: 3cdefec4887752f7af37738d253a3523eaa58bc0cd97e81c2a7d498464307d33

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