Malicious PDF — malware analysis report

Static analysis result for SHA-256 5312f511dc09360e…

MALICIOUS

PDF

80.2 KB Created: 2021-08-05 02:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1376c178a8e30b1da6b4ffb47c89fff6 SHA-1: 168c4212a11301e2f37fa5a96c5575a6403a81d4 SHA-256: 5312f511dc09360e4ed5c7387d6ce106137639afcb7536f9fe645a0c37fb17e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=ardaas+karaan+full+movie+watch+online+free+filmywap PDF link annotation
    • http://harissarantis.com/userfiles/files/96100682710.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/38251888937.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/nutunufudad.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081986cb9410---78070809898.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/79328406512.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/movupokukusoselezu.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/46540450054.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/773004a652fab67338ce3e582bfd6f10/97919689527.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/35206415189.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b69855eb3---ramerewufewopasukodunuj.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n4cqadj2nqb1mlob3odp4ovplu/zetoxadobomakefasaner.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc98ae58e---77017523283.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/jasogazivozowav.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/7v6s1uavq6ftcgstd1gbva76ru/5607879925.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/zixigosutogibor.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ns8ngvn43ebem5gov1l4424rf3/zapipik.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc6ae75e30---88025367614.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/17555213252.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609881f7d97f8---88183394256.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160880460ad34f---gagugabevawoli.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc95603329---vavuzekibodex.pdfIn PDF document text
    • http://inncredel.com/uploads/47875580990.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9bbde2e382b7892c1d9f925391608cc6/xatenepeminemaxomiw.pdfIn PDF document text
    • http://htygroup.com/upload/files/21779576943.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/61t5t5f5l522ttbngpa9fipdk5/94372698597.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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 16772 bytes
SHA-256: 1fc5d12f8db4eaec2966abded371d46728f7ba1c4b2d03a803ad39f9fe5accb1
font_01_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 11324 bytes
SHA-256: 6ed0f96dab2d65d73d5590c3799cc067f0b063f94c613cec70fb17582310ef47

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