Malicious PDF — malware analysis report

Static analysis result for SHA-256 173cbf4b10d120f2…

MALICIOUS

PDF

92.2 KB Created: 2021-09-08 08:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 696c447b66d912a8eae10765ae51546d SHA-1: 266a77dc2a4729504be2363e20e52215d488b229 SHA-256: 173cbf4b10d120f255b35577a1f3fa7c9efb17d52e352c45719fdda6cfd56124
156 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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://adamlegal.com/userfiles/file/362394020.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f38307078---bebovotukuvi.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/junesupufepolalerunopefe.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2sobmhmdsme6pgo4r3jnu3v45r/fofotanawejafarulakajobeb.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983178ceeb5---67721586891.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/95352178690.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/damugurepaziluxapogobob.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/42867821548.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/bokixajalones.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/bdn4lujb30h9d5s6sp9v13thj4/lefawosapiga.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/95506980498.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098152086e03---safexev.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/86462711327.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/zabexosodurubekojef.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da5edfc7e---pudejoviw.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a001a6ec89222d1968d860cce1c9b54e/ximufawezimup.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1b35846459a90d55e56976922ce36f68/95472050953.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/20303105053.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f48901112---fobotononamemubefebo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/2363455728.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jawadarelusereru.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/popasuzuto.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a755d503---winuketumixamiju.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/46682076519.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd57e30de7---jivutadifu.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xujomumuroranaxipazuwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vlsi+technology+s+m+sze+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_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 20628 bytes
SHA-256: a05d1b4c462e201756118b5ddb67b750ce49c85f3e9b5a086388fd8b708fc772
font_01_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 10948 bytes
SHA-256: 5dedf7b09cf9c5c13fe0b7a0ea766a2a0d696bb5eb7f709b754ab30262c2a6ac
font_02_sfnt_off00014af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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