Malicious PDF — malware analysis report

Static analysis result for SHA-256 5466c85d68082236…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 06:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4ef22dbedc03162b453e36bea8d2291 SHA-1: 3d1de4e12312fc4eed11433a50b663ec3e058758 SHA-256: 5466c85d68082236c6e5f2d8181a03e54fc907f19b9f5074086a1dbc6513611f
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/57950835290.pdf In PDF document text
    • http://infas.cz/images/wiswig/file/vewolowadipumetukux.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210914100747.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14062659791.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/giwivozu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/65997703786.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/38b17f567beccf1e6857de457f2481d2/14932743491.pdfIn PDF document text
    • http://koutingchina.com/upload/files/98641792717.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142b07491edb---pujibukopudamenire.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/12069401971.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gqlvh0uuv446gs4esd59oilce7/70971424191.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/58294653480.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_182945.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/83042879939.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/birafezepewilide.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/62456442917.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c9eb415d4c20965275373a932b6290e3/moxetamejexudopemupazel.pdfIn PDF document text
    • https://adci.vn/data/upload/file/60325838912.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/dukigusedapuwogelim.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/43604560045.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/losomasutewu.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/boterukidaleramopa.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/83229696508.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/34280300710.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xelofobofarebemosufuwifil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=story+insta+ruPDF 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 10212 bytes
SHA-256: 5a320d89253991d5444c78a7b39a3fc61ec6ee12863b595c9c166e5b685eeabd
font_02_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 22164 bytes
SHA-256: 6941ddd065aad8307ffcf309e0f3341edfe3b518985874a8f5ffc76845a796eb

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