Malicious PDF — malware analysis report

Static analysis result for SHA-256 2524753fbd19e8c9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 06:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a6b14dcc59236262c53a4f5d69aa84b SHA-1: 53767a1c30d48cd3d9e3470cb418259881912a6e SHA-256: 2524753fbd19e8c9940e8fe395273223f30f861b37040dfae850651ba1ac171e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ketchas.ru/uplcv?utm_term=andy+tanner+stock+market+cash+flow+free+pdf PDF link annotation
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/xadozaxelaseguniwo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/629a90a5e4b3a288d1472aeaa2ef3b66/xokupirozorabevugubusug.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/rolelixisimup.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/jimoguximamo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/tanitepar.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482f7d11571---88008859673.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210902094901.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/laroraruxifoseketul.pdfIn PDF document text
    • http://guchen.ru/d/files/54802978763.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/40462496105.pdfIn PDF document text
    • http://kodemari.info/data/files/verakigemunibo.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/79846370412.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8b7afc0cba36a34ae49ba53e16fa4354/feketoxowu.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/ganexoridodazabederir.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/zisaxus.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/21831588508.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/jaxobiwukonulejo.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/fewukonununowuximu.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/temusogonuxuduloxav.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/15890253314.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/zalon.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/zedipuvizegabelupunure.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/71836277164.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614491e96218c---gumepifawajojazil.pdfIn PDF document text
    • http://badgerhillfarm.uk/6985260051.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/68713490364.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/rapowunavusadaduj.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_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 15632 bytes
SHA-256: 47f61fe4dee82d1c46f5b45d3b0165b81f75e768070833515954310a99422b9d
font_01_sfnt_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 11068 bytes
SHA-256: 170b0c5ea66e025cdce6ca09842ab95ba1cf607d631998594615ac16adcecf46
font_02_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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