Malicious PDF — malware analysis report

Static analysis result for SHA-256 6658c4cbeb2e6402…

MALICIOUS

PDF

98.3 KB Created: 2021-08-12 03:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c88bbd94b57bda663e1c748037219cae SHA-1: 478a247c7318e957c06ed2bc8726c0e995cb7a7d SHA-256: 6658c4cbeb2e6402c445afa2cdead9682cf24a4e7c1a3f339c7d8612f3efde29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://bestofbeer.ru/ckfinder/userfiles/files/juxulexarukiwajezipike.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c63cb2e34e55c657c9cd15f76d46b176/mivaga.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3v1fn3vceqksfhs41k80gsek74/24025542892.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/pepes.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b2smpl3garpfkgbb3n5mgc85fs/bilomazelarufa.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/sojaxalomulo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f370e7e688---fapanategenari.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16073b80f820bb---48105549273.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/80595320804.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/pesuta.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/28270080859.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7c1611ac---51438483062.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/84461511978.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wutulovoxusedijut.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10756114149.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/83f96df45770886ff4e0a40570011731/zamepumimogari.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/movodabevuku.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/jutatonemelodebasaboviv.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210801235504-87136791253.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ba132d6f027---beriranibifuvawapifamamop.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725c844233e---bulabizojibedoreforiwawo.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/88523731872.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/84398481523.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/fevefidopegudapuxolanaj.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7536ac3e30---jovolenabizilebotusadu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-22/20210522031524985596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minacriss+icloud+bypass+tool+activator+iosPDF 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_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 10788 bytes
SHA-256: 1360166a9ab0b5c197fd87383d243a43ebfd3bbcdb3961889d297c610c9c3c52
font_01_sfnt_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 18568 bytes
SHA-256: 83d32a9144a7f77c36c165dd6e302fbb3dcfd0626ad067790ac8a5d772fb3a6e
font_02_sfnt_off000161bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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