Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cffda78c64849c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 22:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3da17a17dc4294a5000033872c343dac SHA-1: ab755228976cec4306c5927f5cf6f64931596306 SHA-256: f2cffda78c64849ca0ef79e85541cce88ab46ede41c153c07964164b85988326
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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=best+and+worst+pick+up+lines PDF link annotation
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/93424450073.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b497c431cb---73435462998.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/74417410798.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/wijutozofusibuwumuzofuti.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/fejisifoxolobokob.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b8dc6d456b9a9e60052118291fbfd7db/rapudedapimexadupuzoriz.pdfIn PDF document text
    • https://carlojans.com/cms/file/37771839176.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8de49aada70be936e795b8e3a596741/31695713504.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16139d455c2859---50033394324.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/63mkmvehnbqimbi911p20hjon0/sowurarugajogajep.pdfIn PDF document text
    • http://stylekd.ru/files/jopakuwin.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/jixolatod.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad24060fd9---lokepizurelajufoxivi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614041574f253---1608517641.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0aff2b7d1---javidometew.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/26914768288.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2996767a1---13280936549.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zekozavu.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/sirebitari.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/12546334782.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10052690457.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/rajetereruji.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65566999697.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/xixasusojamidulugeluvovob.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_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 18076 bytes
SHA-256: b16b62c9edd9161c82aaac798ecbb901ea0a147bf29b54d8f27dea909647aac4
font_01_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 10840 bytes
SHA-256: cdd8a1a3baf915fb11c864dbb1aec6c47cd09a8b1fddbe8192a0248d4d509fc9
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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