Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f413d09b0807ebd…

MALICIOUS

PDF

74.6 KB Created: 2021-07-04 04:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9804bed74eada33a7df48f34390337f SHA-1: 7e0c249de85040f50d5658bc939548478b30d812 SHA-256: 8f413d09b0807ebd693f9aee9f69001778edb4bdf5f7ccf69dd50e5f42bf1e62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=table+of+13+to+30
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088f66645fd3---dujinemukekokov.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0250c89cc8d495ef6679c6350f50c5cc/rulavetemifa.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54071c5dbe---77500543058.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9cdde911d36fa165d0fd549aa38d85ac/8294823926.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/94cd1ee9c57fa692bc78c1af0513a1ca/1404817258.pdf
    • http://benrassam.com/uploads/files/71549881626.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/86020jlogthbj48k66elvtrv97/56283233596.pdf
    • http://drairtools.com/ckfinder/userfiles/files/48114459453.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b7b52b7bbbc7c08c9385a9d7b119cf1c/rovixumogopoderopowe.pdf
    • https://caffedisanto.it/file/resalilezirawinesu.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160763768a60dc---xovoborilulixoxuronesuzuf.pdf
    • https://eingangrad.ch/userfiles/files/73423206424.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c96d4572---41308718767.pdf
    • http://frangarcia.eu/upload/file/rubeg.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d10b8969d---12978401033.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/72f7ca4417c3dab260b45172df2c9e3b/lumisajonokakapavu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l0vb0n8av5mhr698g1o29pgblk/17485787475.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/wulobiwilifugurot.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d4832289d6c462f955e3554b0922b3d3/semotuvidojovopa.pdf
    • http://hasici-pristroje-eshop.cz/files/file/dutosi.pdf
    • http://crosswaysrecruitment.com/userfiles/file/29747310915.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/lvetrfe0dr32t5mska3ursvbhi/budowebub.pdf
    • http://luckdidea.com/ckfinder/images_store/files/88830987618.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84325e197---25652665717.pdf
    • https://theshamrockpublecco.it/file/33345578391.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_off0000c4d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D7 16792 bytes
font_01_sfnt_off0000dcee.bin
45fe16852df9c8d11261d1de65ded4b0a4e0262bfb8e8c27036456c41c2a2833
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10192 bytes
font_02_sfnt_off0000f405.bin
251d440457e74623150665b8c932aed30ec4568a74cc0af13c8c159ff16653af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 16084 bytes