Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fdec012f4dc3a1…

MALICIOUS

PDF

76.6 KB Created: 2021-07-30 00:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93aa90395c2dace4f66e0a066a4ea108 SHA-1: 239f5c80e44ee125fdc4538e2541b0287750ff58 SHA-256: 77fdec012f4dc3a1cc1db5c0203d5da4eccd01df6f8372e2b6331f559a549bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The presence of these links, combined with the PDF structure, indicates an attempt to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c601629fa7---68019604565.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/251dec114c6a688a9741107049436f4a/liromeramidiru.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0kiofshco5e9sege12kps0f77v/napawepekatowuduxokazud.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///65531614521.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c3bdd06f145f8ed2fd19c17d302edf33/2406811045.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/jabefumafobinaf.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f9fc027819ce23c432ee8b20dd5d0251/47173784073.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bc4ac9056---24705842655.pdfIn PDF document text
    • https://rm-parketi.si/uploads/xirutobewefojuve.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/pomunowukupuniko.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fffb13bcdf4e80c672bb608792dc3c40/1844198648.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/laxewuvemu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e6f4c97ed---10226439881.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/rd2dmqnjv406k6cl1a2eb2m8k0/losapo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea14e49a940afcd7a305250d54a01c97/79065286258.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/dokapibenaxi.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/barogiwutagera.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/bojonef.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0a6df9e8a08ad5e0b8e65df33b0dc3c3/96912157915.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zufamuwamaxifen.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/71a2c3c272452725032c2d9115de3818/kunodobopexal.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/56577429877.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/18009772623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=makkar+ielts+writing+task+1+pdf+download+freePDF 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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 10896 bytes
SHA-256: 11635c8fe8001977298ce1501ce9b792c671b6375319af3589596cacdb741241
font_01_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 16360 bytes
SHA-256: 67b50ec8738f10994c78c2ff51517bdc1b678fc85698cb4038294be7bffa3734

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