Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b31037d30d0538f…

MALICIOUS

PDF

99.7 KB Created: 2021-07-25 05:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f678d6f826be129727404212e35b004d SHA-1: 4fe0a5757060b5fb24ff79aaad55e4c6205b42ce SHA-256: 0b31037d30d0538fcbbf9f6b9d6692619d712c81c5cbfb0fea0e6026d9356a90
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://aias.pnu.ac.th/ckfinder/userfiles/files/3899087216.pdf In PDF document text
    • http://liberty67.com/clients/41815/File/48041512377.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b78b2ec1b---64853555637.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/javonutefotinemug.pdfIn PDF document text
    • http://chpcentre.com/files/file/lavisarevobir.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/67779232889.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/7716260989.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/80928079945.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/fqd43ikev3gcuagvs48gr9qkdh/mebelowuku.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/winipatemafoti.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1l2crnkrvs2uoucejhqqg6v5c2/jubowufutevumasexazirase.pdfIn PDF document text
    • http://pinxedien.net/upload/files/puvotulikakababuxo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jusugerapekeximafineve.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cba213e08---kizavabimugazidisefaxel.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/99dme3ouuroinm2brqof7otbpg/81733785555.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f4b813266bfbb637862cd0d23e6bea0/jubalanisoluberebegakepad.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/20779975293.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/c75cfnkp36jibfdnqqqnjsm2gu/jeneme.pdfIn PDF document text
    • https://dafelia.com/files/40310793559.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78922d6f3c---47631702848.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/13181477118.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b49a88f7f---28047974243.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a1b775e1---xigiwapenom.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c094050aad8---49524315426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+study+for+the+servsafe+examPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001239c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAE 16868 bytes
SHA-256: bd89ab14ca766a6505665ef67eb1aa0e7ad4b5fe70eb4cfc4f62ad8a782d2206
font_02_sfnt_off00016764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16764 10836 bytes
SHA-256: 2c5c723730a37bb3afb8efe2c820fc060d5fe5fb4313b74d854ce103b38c0908

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