Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bdb2b36869f4bf…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 03:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd8ee71e6e12afc315e14f6db4a9b212 SHA-1: 9a6fa83201888fa87e15f14c0b52b371c3e2b301 SHA-256: 50bdb2b36869f4bf10984cc12ea798365e5497ae38d583416e16eef0671fa257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://neonatal-surgery.ru/userfiles/files/77531671029.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1acef3a4---24988518151.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/93522673769.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/21035465774.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f763c92b7---bofefapazukonotovolukak.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/jawaburasinenezibegip.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210714010739.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723460face---51895523962.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8e8c0ed2b41804ecbcb7f1604a0c074e/63286932457.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64b586af81---50772078833.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/iufa44rh68m4u4fvghjfe5or12/43835850074.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/62439189078.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/lapajabipilewuwopozo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/44de4651600dfa889df00652f3b1cf8b/xonewanubizow.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/44842230279.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/wuninizek.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4633057fd3---toniwuvimula.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/75757035646.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/7166670928.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/98014546629.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/lepanag.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/folasarolupidunivas.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3b3cb0c7---tipudojepanopeganex.pdfIn PDF document text
    • http://rc-modeller.se/images/file///65929934929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=uln2003+pdf+downloadPDF 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_off0000b65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65A 10408 bytes
SHA-256: 0a265700a9fb672137c48308df33ee1e9ea1d6022600db6b4a19a30f65c29549
font_01_sfnt_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 16492 bytes
SHA-256: 302fee1c02183f74d2d5b56cc929d5da7742218dd2695a3f1bb303befafb7227

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