Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc26bb421e285a5b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 21:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 97734e20a8f1097c3dc69fa74f50f204 SHA-1: 9c50c3a0da093aa8fa9fcdf4443209c1febdaa41 SHA-256: cc26bb421e285a5b611938e8852d4e4bc3f4a196e8500c1ab1ce4e9e6afda5fc
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick users into calling a fraudulent phone number, consistent with callback phishing or tech support scams. Numerous external URLs were extracted, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://inwebjor.ru/uplcv?utm_term=olight+r20+javelot+manual PDF link annotation
    • https://baoholaodong24.com/userfiles/file/majakupozejaxudaxojasot.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/61745948758.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210626_56EA2F00AB26049E.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xanulagatevuwisudoxe.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/wivakudupokepabozaba.pdfIn PDF document text
    • https://onlinendttraining.net/files/xiwusigule.pdfIn PDF document text
    • https://drlanda.hu/user/file/12426159592.pdfIn PDF document text
    • http://matras-devison.com/upload/file/dejurolaretefaj.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xalipinisugijalolisozi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a941806b---jovopaxojibi.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/bodiporaluxuzedida.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a98dc6a54---larerunuva.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/57650141391.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zosademalegobipe.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pasegijilivokilagelozore.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/8208605491.pdfIn PDF document text
    • https://schmitz.cz/res/file/51885015173.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/6o9tpp8cimel48vp3m05ssoo1f/memufegixituvowo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5986a3c8e9---mugilogiditonigujaxuda.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/2d9aa391fd49ab123cad97561f001a37/90463672070.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba692c1e91---83000101364.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/tadopupopiwono.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/vara29mu6f5shbhkfefl3jdrfi/83438153762.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9478529399e4dbcc727ab39da6419c21/julepexepugojeraz.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/fawajeb.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce19e2600---potibisezoranubilafewur.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • 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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 17692 bytes
SHA-256: 52f5f331e73623676578b7a9624c1b5216789c26f9189178c093d6e46f9bda28
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 10948 bytes
SHA-256: ce5b0b17df0500c6917bacf73ca459d342e3cd50721f38748b9b3dc2d8df349d

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