Malicious PDF — malware analysis report

Static analysis result for SHA-256 e578e08389d87167…

MALICIOUS

PDF

136.9 KB Created: 2021-06-26 15:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8f04e4c741708bcc06563093d11e94c SHA-1: 3712cf879f2ab2353a5a02600e1e0c00a534aaa8 SHA-256: e578e08389d871674b4bb756234e7a3254b52b9131dbef1f377f1da8c747925b
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and link farms suggests an attempt to leverage compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=snivy+plays+hard+to+catch+full+episode
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cs0ul45t2jtsdecd4rvj835kj5/pavemi.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/2157841339.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a8dba2608cd0af14ec74619a9f81be7a/96419235328.pdf
    • http://cocoal.com/uploads/file/30881904365.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/10855260887.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd1b80e131---guvezizutagu.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/leejrjp1vujud3fa404jako0cr/pugelisojugejo.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d9954ada---5343920359.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ak94b7mr1lvch8h1ago5kfvm07/16875004636.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee57b974e---modaw.pdf
    • https://go2germany.ru/files/file/ginibinulemujibidoviromu.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad01ebee3---8311443241.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9b160a49---zumulibez.pdf
    • https://agrilaui.com/userfiles/file/jibejejalepede.pdf
    • https://canevastoilestjean.com/upload/editor/file/94867847715.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bac92ebb---jabiped.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9f8a688daad795929eb287614c87d135/lolenewelo.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/489f943d58a7fb033f86b650ebde1ca7/napejinolaniduza.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84225807af---kilewumagixufojebu.pdf
    • https://lacecinella.com/writable/public/userfiles/file/91720220450.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb45568cd---lepukekeralad.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2ssk041ksit16uqku1p6bsdfr1/mopodaninutuberakav.pdf
    • http://svsteinfurth.de/radsportfiles/file/35929818485.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/43333619600.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_off0001b8ac.bin
8a991f318271aaa4a0bd006faa4a93c5a4a403186615037d1ce697eb979e302f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8AC 16888 bytes
font_01_sfnt_off0001e3ff.bin
9f86b2467f0fbaec464790641d4586720a81be60916e855764d0d48561458a50
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3FF 11072 bytes
font_02_sfnt_off0001fdc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDC3 16792 bytes