Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba4d7c0035fc4b4…

MALICIOUS

PDF

103.8 KB Created: 2021-07-29 23:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d5f77d2eb989334ed70d0c71eb07f95 SHA-1: b038ac84e4a39dfbdebb3591843a32edc5bbd95f SHA-256: 8ba4d7c0035fc4b4959adc8ed8396f156174e4963ba2c42c7243135586770ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, acting as a link farm. These links likely serve to obscure the true destination and potentially distribute malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc7a490d6d53001081b49d6f43a20f49/92842876613.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsrbh5l07am4dpp675q1l4rhmi/xalik.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf758b6ed---goxomokanixe.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/70927833639.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/73551882277.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe152c285e---48237554843.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/milorisivebuviwuwix.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9iieprmtl5sv1pim5rme5baj85/68551495799.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/nabubogefiterigolulix.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/48323218575.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/2586096079.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c275fc8---45463987222.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5617644862.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/a44otdaa069pr466jui49m7gv4/49171043380.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/73023572533.pdfIn PDF document text
    • https://pmms-online.com/assets/file/zuravexoteleko.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/082c72e6745e661978927a2a884b7710/berijijidokaxilekujaj.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bfcc628807bcfcd003e173dc9187b852/togopixuwofavijimew.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/38a9fff2cb6915ec0e9e979e948d4cba/beketorajawimi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1f3e6b7d8a16c5426c3a06aebbc897c1/fisiw.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/496d2799b9ccc5a3bbb87c492ac1f7e8/towejeme.pdfIn PDF document text
    • http://aquatherm-graz.at/files/52304680500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=racechip+xlr+manualPDF 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_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 17676 bytes
SHA-256: 627270243800ff82ebe0ef103f5e728b63b9cb157ea28ff4770549f6c035e6f7
font_01_sfnt_off000161ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161ED 10500 bytes
SHA-256: 16322280f76edf5852ece3224b622281fcb521d1fc4f90b838d5a610f9fd373d
font_02_sfnt_off00017992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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