Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd425f5887cf35b9…

MALICIOUS

PDF

80.2 KB Created: 2021-07-09 12:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9db3c70ca2e023bab1bd792d6409b66 SHA-1: 92426c1da2a1e0a1bee5bf3875a5406329b0db69 SHA-256: cd425f5887cf35b9564a4b4f1d12d51c40675c2460ba1e0b90e4f211fb79729a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent, likely facilitated by the JavaScript to initiate the redirection or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://5m-tti.com/uploads/image/files/37114646443.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce31e088e7f---kegidaremowekovoterum.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/54644015150.pdf
    • http://assistance.uz/images/shared/file/37506752456.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bd566dfecba6666ab53a2eaa39802a0c/6775519292.pdf
    • https://biovuspharma.net/userfiles/files/dusufuxanukununa.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mvj0sr05d61o4n9onuuqkaos77/kusowofisusobelon.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/394dd88eeb4cc37b4b03ca17ad77434c/zonatidebigetopolururubi.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607460895a140---gamidozekekufat.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8533e22e---44151014343.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/70576851340.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596b38938---85409926875.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e646117721---33760938137.pdf
    • http://eot.mn/uploads/userfiles/files/2225666578.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/20697023929.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7b6a33a8---nogugojarowizuniwugori.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228c17d79a---68787794298.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728413ee386---58910164242.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb6ea18ef---51769704135.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/zibisobokusi.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/uj9u28ocj90i1dqm2nhg00jl57/lolurixilebudojasakemobel.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/vewexov.pdf
    • https://tahubunting1.com/contents//files/motorofuwaz.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93644b948---fasuwimewadewevozozuxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=80+centimeters+to+feet
    • 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_off0000d727.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16792 bytes
font_01_sfnt_off0000ef3e.bin
9fa6159779a8e5756b891be9d49b3149f6597d34166391d8c52c9a32f273620a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10524 bytes
font_02_sfnt_off00010731.bin
2cb7d04b8e2742da503f9a4372fa9756aa065d33ec7b004f31c1d27232e24b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16980 bytes