Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cec60afde52ef05…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 13:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39982d1f02c0a1ec670d66ddc848f9e0 SHA-1: 2229a791a539a900aa31380eb6cc11f4ff3a3ea0 SHA-256: 8cec60afde52ef0546c1e5a7fdbbd4586350048d3c66f16f018b655f741bad73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using such sites for malicious redirection. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=cbse+class+10+sample+paper+science+with+solution
    • http://alibabashipping.com/userfiles/file/vetopofufoxugemuzaxizafip.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2de4eb86db75e00003b2f5ceeb653ebf/32717419678.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/84201354526.pdf
    • http://sahrugs.com/userfiles/file/47236342093.pdf
    • http://myxroad.com/upload/userfiles/file///xinikerosotovozut.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c3a1aa8c115f7edd64ce98bcdbe5e6f2/dugolek.pdf
    • http://monkey-do.net/userfiles/file/35732183124.pdf
    • https://anukulagrotech.com/userfiles/file/sojegivi.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac1939224---kimuzufizova.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6973b2ab4b3f3f224480fba9dee0a500/87961140360.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce4ce26ba---53873085807.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/47859181300.pdf
    • https://accuratesearch.com/userfiles/file/zedepamuwirixizujul.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/05fskqgm7te74bnrj3rke5d5u2/34201571050.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/sibasakixusajofoxajironut.pdf
    • https://eagle-aviation.com/userfiles/files/rewatonu.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rng59pq2l7498ss5ct7oopiskv/lobake.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6648754bfe---45943887107.pdf
    • http://www.puhito.hu/uploads/sudufomarifurovirur.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082485626304---21319063882.pdf
    • https://b2cexpressdemo.com/userfiles/file/wewitabasisozexijesu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd2.bin
58e162af3daed7e3d6570010fc952a35b12050ae01db289280edb20f97bda59e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 11168 bytes
font_01_sfnt_off00011699.bin
324299bddcd4abf65929d799941c20e7b92c86bb20815272eaec13be4aeaf645
pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 17708 bytes
font_02_sfnt_off00014544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14544 16792 bytes