Malicious PDF — malware analysis report

Static analysis result for SHA-256 4190160f07817401…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 20:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a089a7446f8fd4b6e3e238cad888b28 SHA-1: 7486857d1367b52cc6d46bd9b25c17050fdd1b52 SHA-256: 4190160f07817401b00867304f7c4797b354664b5be248da39ba299d6d8c748f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The 'utm_term' parameter in some URLs indicates a potential SEO poisoning or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=key+issues+in+education+and+social+justice+pdf PDF link annotation
    • http://cnmrobotics.com/files/files/zegilokulogujexabolafilim.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb45edc1970---80714622105.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/limonusajuzunexuwitur.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/nabakolinigajozakazix.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada15f9e30e---vofilewafurisineviri.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/85894171457.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3945b698c---30810199706.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/92118388136.pdfIn PDF document text
    • https://rintrans.com/files/lavatonefu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/eed29ebb6f3306dbaaa6d6149c89a227/47992250996.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d3410eea---33531115606.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/87f56e36ffe6357401be3aeed32c2f64/70146516876.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/17006384203.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/xavesuvoledadavib.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/81334468406.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/62356856791.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b894b84b2b392b0e36a1e32b58f5d61/79203914629.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717fbcd5dab---rikigikurebagusesireb.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/32327934009.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/05b69d8d522460647a2514bbd8044301/70268421146.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/vadonaginofum.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f19f1301---kidopem.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cc8a95712---15902984205.pdfIn PDF document text
    • https://brod-plovdiv.com/images/97428686089.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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 17732 bytes
SHA-256: b90371f0c8b46eaa587b5f24cabc5e405611d404413a6f3b1dffabd5772398c0
font_01_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 10848 bytes
SHA-256: 64df8266464b7f44c0c0e8f684cbc7afb56adc6a8f2c170720219a3970649990

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