Malicious PDF — malware analysis report

Static analysis result for SHA-256 515c75eaeda1af23…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 18:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bcb6b9d68afbd70ae4d838c78656caa6 SHA-1: b5478691336c2693b1ccf9155c61a59b73ac33b3 SHA-256: 515c75eaeda1af23d87365249721c3c3c99b86789211b90191736f6de7def57a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=miotomia+de+heller+tecnica+quirurgica+pdf PDF link annotation
    • http://boschvietnam.com/files/usersfiles/files/tulipakugisi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be54c8a4e---kiforon.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lezos.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/41589127781.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4420a3a1b66a78e6f3bc47b5e0d98cf8/wajufifegekepifibomexunos.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wulalavefixefulafeg.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/pujuwufatanosegalunub.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/13989228571.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd324e892---26381977926.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d10ca274577f4103cc4df44c10fb9972/92565311683.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/45b35ed7734967b5411ad02935690b6b/2112335308.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/4f18b249aa1bf24a647709577501e035/18048620909.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da22f188c---napiwulabofedupafagodux.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0495ba7bf7a23b9c89a1c5d5a9e7aed/27108973159.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c714122bbb---zedivajepobu.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/zorenekiza.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/gd8vhjbeg93ach3hqlbmm46ecg/64014924040.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9935d5a9e1b1fe20876a371fdc9693dd/10531711084.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00ec0b708---mudawisubirofatel.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///31229423673.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nevinuzalema.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8f54a9609ef10d9fcc470fd96bb8399f/66598365937.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/wedunuxez.pdfIn PDF document text
    • https://eclearusa.com/images/file/78748414081.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/gofavoxazazu.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_off0000bbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 11140 bytes
SHA-256: 194434875ab15e1bd8abd4d75cbab63970d92a93a1be35a4c97c30cfd1d3ab1d
font_02_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 16196 bytes
SHA-256: 9f2c62c1b82d54c229391491f2f32b5bc11fb4e7b926999a2b6605e6bb25f954