Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c751ffc3df0cf5f…

MALICIOUS

PDF

76.8 KB Created: 2021-07-12 17:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a85948b3d68695c019ba42f06947b30c SHA-1: 40bc616facfa013d665ef31f97e92f89b54091b7 SHA-256: 3c751ffc3df0cf5f94f419f5242c4d49b30206ba22b4f67056840e8ae03e4839
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://iproperty.ae/userfiles/file/3229163357.pdf
    • http://allaboutdowney.com/userimages/lotogavoxesepelis.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a456d8c38---82257708299.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210618_093411.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/sezanemusep.pdf
    • https://ktmcollege.org/public_html/userfiles/file/rudoxavepudafovuvipusal.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/90768b7f9d7e840b96a30627e00de7b1/tugesolu.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0796aa665b---15504374652.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ac32e604c802dc839539d20e6e13ef07/36844316629.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333422e206---sogexepubemugegodi.pdf
    • http://juha.be/_files/file/xeleziroza.pdf
    • http://jarosi.hu/files/file/popasemirixusis.pdf
    • http://bukharasuwanee.com/sites/default/files/file/26690741873.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a66129200---57508345204.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56cfd6268---7633366839.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/joi7c35eb1a0sohv26jbjgfe4s/pamukafabusok.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f972e86b75---bikoxofowotawala.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cnh1j365v4o2a7i8h6p06sct26/94633338794.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cbe53783f2654a9c8df451c0db4b802e/4527369226.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/plqa863sqojdpi5sr0oq32njoj/32963516126.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+split+pages+in+pdf+for+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16792 bytes
font_01_sfnt_off0000e330.bin
5d71a3dc8e61bf7cc2b3623cd75b6f9f54edbd34bfe56a2f0541dd538c75c19f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16212 bytes
font_02_sfnt_off00010d4b.bin
21c16efe4a1f5af77637a88a4f9dc796c31577dba3236010e5a34e404d470aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10748 bytes