Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed475e80eb0b07…

MALICIOUS

PDF

78.1 KB Created: 2021-08-12 21:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: addc82d23ec7eb11ac680938ea82cb1a SHA-1: 62ff992fe0149b572acd4a1e7b5c641281d8f82a SHA-256: 66ed475e80eb0b078cd31191aa37cc589bc3b17272eca622fb609fbb741ae7aa
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The primary attack pattern observed is the use of a PDF document as a lure to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5182

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=template+meal+planner+with+grocery+list PDF link annotation
    • http://www.findvoters.com/userfiles/file/79795285113.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074490f65b18---87095977597.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/dopovesemonijaxuxox.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ee564da2977---relodoxo.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/22088247934.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/zunodomapawopuvolujemapo.pdfIn PDF document text
    • http://zerosquareonline.com/file/xoguzuxatolenenor.pdfIn PDF document text
    • http://slsnn.ru/content/file/bovafetidebanodelopi.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3303fcf06ea872ad343e98be7e4dc2c8/xupenavusijugawolinufok.pdfIn PDF document text
    • https://projetovm.com/uploads/files/88796502828.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/bibujozunes.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/jafoxurisufodokoku.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/zogipaliluvivirubusadifa.pdfIn PDF document text
    • http://debden.org/userfiles/file/1242577365.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f786327d3a3112d70eefe9c41cc04bb7/54803419373.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gvq9in1l35ihm7uadvuf0e699i/befipebowexipozivufej.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/d5selfsd9a3rcdi1b98at1rq8n/zawul.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/91914802163ea020b177e63f9c420c9a/fidipo.pdfIn PDF document text
    • http://orthopediedelft.eu/files/84506248203.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9fd4ea53158185c50f60d20b3a33df26/17453124321.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kimuxopow.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/da92343497c0b6b604611a8a661e7471/jinapemotaxafusesuxedarer.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607499fa75ab9---lozotuxasamugipagavowu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10984 bytes
SHA-256: 8e56d16b8371b0321b2d3f985dc08d026f2693c95b93eb0ae187caed581b21d0
font_01_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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