Malicious PDF — malware analysis report

Static analysis result for SHA-256 8640366e33ce9c9b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 06:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 055f3c6572b83c72693d6cc6ceca5157 SHA-1: ccaecade8adb16439c97c4215e48bd08cc12d01f SHA-256: 8640366e33ce9c9b914d0e79461aedf8a242f8ce846d1617ba0e3c175c87ab8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. Although no executable scripts were extracted, the document's structure and heuristic firings indicate it's designed to lure users into a fraudulent interaction, likely involving a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nsck-cykelmotion.dk/userfiles/file/42939153341.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a7588abf9---18496039234.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/xovaje.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/n3lun20v1s6tfs38r6ga06vajb/17191885211.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7cbc897a---fijafufeluf.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/bafejere.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/4694442627.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/94535830140.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/53895316270.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wufewesamokataneke.pdfIn PDF document text
    • https://angkalaris.com/contents//files/risov.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/41995742717.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998e4600e91---189653588.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f95c1df01---94057930753.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/a6fncfhjdjboe1gf35ss34h45j/85153854113.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1095616d---munutilejibewulogitijukum.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/gelijojuselebirujob.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4u8urqull85qqgqheljq4sunhj/40828599013.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/99859347998.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/mizubunetepe.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/85422951432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=polycom+soundstation+ex+pdfPDF 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_off0000c32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 10996 bytes
SHA-256: d7f3343e4676e849b4c696c992d9936c2059193fd8fb3ae5c73a9cc436f729f5
font_02_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 19124 bytes
SHA-256: 3ab8d7cf6d13c1926847496b760bdb49161abb9b2eb57ee1f07c7d0b818c2ed0

Open this report in the interactive analyzer, or submit your own file for analysis.