Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ea441272233d7e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 01:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bf5f4e4e38b2a20340bcc00e236538b SHA-1: e7de163d952a1cee0b346c6ecc0d9c9d17302ec5 SHA-256: 61ea441272233d7e37545e895f764798c8c749488d77d96f596ce5f3199db297
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URLs point to a common tactic of using deceptive links to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=linux+system+admin+interview+questions+pdf PDF link annotation
    • https://hamayeshniroo.com/shop/file/jefosizeza.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/84605559363.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/91298416283.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/milimonetijokoni.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/73585435145.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/41973246410.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/98896300577.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/67874346698.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16112c25b585c4---84718938876.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f63820511da3c2845d8318efedc7ff9f/21856595292.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/wixitelupivoxetekopu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608513d1c2ea3---bigogol.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/bafitaxowijulaxuz.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdcb72386---95023381334.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/wifufisabiforoxez.pdfIn PDF document text
    • https://somogyplusz.hu/files/kuzazolidepajosexejudis.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/silevejor.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/nozitibivurere.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/sulimijagelefadawir.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/muxozavaj.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/pixovalo.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/julurabavex.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceafc2a210---83617280572.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lv8kuk1hid4civr8ld1lr88iqt/niraranusuladuwo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/73ff6f7b4f4fde71c807fb82ca919b36/rijugibokesajikizix.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_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 11184 bytes
SHA-256: a43166ee22c305324aaffe22484a4dfbfc84e1e36e5282e0206274250c26ef32
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 16068 bytes
SHA-256: 654ee87b1bd8ce97cd36262bd05cb819acc994f770c72743ed9f77fae77995dc

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