Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1ddd1869c71a08…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 15:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04dcd49fdca5472fc378f45fcd7c71bf SHA-1: 26fd8910028ebb73b4e25d1cf4ecb255d7555fff SHA-256: 8c1ddd1869c71a081a11add479b5956901122e13304c02c87f0311d75ea6ec2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms, suggesting an attempt to distribute malware or phish for credentials. No scripts were extracted, but the presence of multiple external links indicates a likely download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cottonweb.net/userfiles/file/717620724.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fd51c7a81---28704599963.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31ca11981---48274535456.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/98b6ebbc60e28d54ef073c8f89518554/kovewufipevila.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16097d36fb33ea---29339319497.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5a62f4647c60a630cb27c9a37f7479f7/37228355779.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5d563bb6---22546262150.pdf
    • http://nowator-zpu.pl/userfiles/file/2277399735.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da1bafd35---14668373803.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a057e835df---gokonipo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad28bd297---pasegofeliwuguroz.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/18266847918.pdf
    • http://rc-modeller.se/images/file///59826649150.pdf
    • http://janandpoos.com/clients/872640/File/40124633733.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/90e0d664704b483c27ecbb79f16da920/laxur.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/633913583.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f24eec3ac---65534738729.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7acd366993---85221020110.pdf
    • http://absolutelyneon.com/userfiles/file/49564670300.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073720a38e5e---godivitosa.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/katapiwefamivotikinutakok.pdf
    • https://summit-christian-academy.org/scauserfiles/files/84374960166.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+3+download+for+laptop+windows+7
    • 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_off0000ebfb.bin
972a1d285ce0243f474ac7cf4913655b7674b36c4a527ebe44724f34d1541767
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16404 bytes
font_01_sfnt_off00011665.bin
d0d2d177da5a77309127aa5c0ab80f05ff6b69c39dc5cc5250042b56d109586b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 10704 bytes
font_02_sfnt_off00012f3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes