Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69450e313e11bd5…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 21:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 287ea00296c267d8527a579dfea9d2b2 SHA-1: b37b7dbf68bcffd9ef6d6fa460d72ee539b4f4a9 SHA-256: c69450e313e11bd5442cd57a6f0150772ba1a229796aa30a1c19751be8b1c23b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm nature is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://investincarpathians.eu/app/webroot/media/files/49928308921.pdf In PDF document text
    • http://podiummoda.ru/userfiles/file/87605884062.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096042ee2de9---82549290347.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1628966730/files/xilutepasaw.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/86031698430.pdfIn PDF document text
    • https://melz-feu.ru/upload/jejosasux.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/56020276521.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1c35100a4e7252203df659dd037181db/fajadux.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/nabit.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/safuwapovokumazevibotisa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2qdosc0tqrto214cfj6bs6vki9/84293984430.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d86936a36260ff8b37640ac15890f7e9/77693312644.pdfIn PDF document text
    • https://anfauglir.com/images/file/wolevolerowujegemo.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210626_5B883552BEEEF467.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/21178562041.pdfIn PDF document text
    • http://dr-temt.ru/images/file/jixagigeguzod.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094829f43801---25850487885.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/kozobew.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3fdb0bfde4d47b459cddbd348ce51326/61805099857.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/puwemofexipim.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/83gtimteqcdfgdidfq4rdmo4c3/kiputofetejawek.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/67294011060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+slap+in+malayalamPDF 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_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10608 bytes
SHA-256: ae498476632466b6d92a8b4b2f1d1ecb828dfccda902f6c719e973810d32d8ad
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 23588 bytes
SHA-256: c7a7002c8d95e0e7834d733d6b258d697843ed140f44487c28985f79c12f093d
font_02_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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