Malicious PDF — malware analysis report

Static analysis result for SHA-256 3256d376816cffaa…

MALICIOUS

PDF

91.5 KB Created: 2021-08-03 11:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d39db17514f3dd1ddf8605cfd6b973b1 SHA-1: 58671558120a5ddd1c3c76ec3ed4fb91e826206a SHA-256: 3256d376816cffaa0309b68dcbf2e7bfc3010de4eecc0d6f5e7edb2598776be6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/1db66a72a11aeca82b852c94c06100ab/tisutasose.pdf In PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867e9c721aa---68194249836.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/titoxezojojozajamopazomo.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/vumijis.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zikal.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3m5mt3qo86gb7s7lt53o7a2js5/28009024307.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/58e2e362bf1d538c201e7ccfdb4a87ce/dubudikikubos.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/bemezozemofopesivisav.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1645d4e1ea16e8c19de8b1fb90850ac5/3065638693.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7cc40308---48796374400.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b98be42---38486507028.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/66mv8d990k5khbkr71t57gm10g/liposululo.pdfIn PDF document text
    • http://brune-schmuckwerk.de/ckfinder/userfiles/files/52885791574.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/23784032925.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/9942143576.pdfIn PDF document text
    • http://www.bash.cl/media/file/tolowadimomu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dd0a19b2d7556b8144e6303fb1c25ca3/pipeneledowuluwup.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2um131cn5809bkkru242clp1a2/79588071431.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b003c9acf0c7386a0bf9c910c780ca45/gejibevuzesovagenerita.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/60924243554.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/mesolejim.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/c3804haj42nsa5nonhiq97e6dm/52798840898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+act+does+macbeth+become+thane+of+cawdorPDF 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://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_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 17468 bytes
SHA-256: 4d0a14e7c552aa02b507080666e6570671d0e2f6381e15aa39b76311f7f4ce93
font_01_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C7 10820 bytes
SHA-256: 191454bf0c7737c7343d0d16dfcbcabb6579c065a18a08d616fca0d65cf2d288

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