Malicious PDF — malware analysis report

Static analysis result for SHA-256 67749edae14eb4d3…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 00:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8bd989dcf25fb429a9bd85e28dfdd74e SHA-1: 0acb5c49a51224bb6f63232dc69db2154dd3da4e SHA-256: 67749edae14eb4d36fef58aa039fa28c7d18e1e0629b82d9b1c59dc7203977e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous links are consistent with a tactic to distribute malicious content or lead users to phishing pages.

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 https://chiuman-hk.com/images/file/73505408213.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077826e1d64e---19611640362.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad40a509fd1---42248718756.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93nq3i1e0d0pmhlc8gbg1cgp4o/nogedulabebijofelalituli.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bac88a4c620---20049621517.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/sepomixukopapoten.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e99357733d---fuxopalikijorududifoxove.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9e9415cc9e443f2dc9a4ab67b1067505/91013588300.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c53cd6f121e---wenavatimiwefokusoxipexej.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/72343653932.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/672635fe52dcc67b67754286b21c75e1/bolasodisaxefomulomuz.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b18ee729e---feket.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fevumure.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/25532582024.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e1c228596425c3046a083873e8f234d6/83912519707.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sufewomijit.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nikemejuxarevufurot.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/memapinagidowegudefob.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/47362114121.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8afc2e228---93075484503.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc98e749fe---63429931282.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc12411ba---pavuzutitefigase.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/gejadesuxujogobuf.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/93b60e981855fbaeb64c3a36d0aa59d4/vujaladuzuleguxaraw.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082a55b06d8b---84775158301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=now+we+can+beginPDF 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_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16492 bytes
SHA-256: 028444ef6bfca614f44ddba7ac73ff9147c7bbdc152141fd20daf59504edf58b
font_02_sfnt_off00012e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E86 10196 bytes
SHA-256: 9fb3c2fe2b991b245654a0d88b3ace14976e3cd7e4558093c84b38e14b6b764b

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