Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e023b396b691c7a…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 17:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3474a8ee9573cbe63244617b9d01f427 SHA-1: b42553090faea8dae96104c54c5f7df56ded71e4 SHA-256: 0e023b396b691c7a14d62df5c7431e73dffe7d2e0160e93e5adbdc81ae6b839c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links to PDF files hosted on compromised WordPress sites suggests a link farm designed to distribute malware or facilitate phishing. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/2062a66f369765d4ef6c504e584cebdf/jonovesutetudoledasesu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607173fc65a93---70929690791.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/543f12daf157b9e7215f58a535a7e218/katutiz.pdf
    • https://scanclean.bg/upload/ckfinder/files/sazawira.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/765bb3d5043a4ef07dd2b38d7e2d9745/9765011935.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f4c28b94e53d53b2bc18f7e8c1e4716c/97308547599.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/pegoronukadifuxuwatafuse.pdf
    • http://ersatzmonitor.de/userfiles/file/27580235089.pdf
    • https://bacninhonline.com/webroot/img/files/9124656986.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/87307687860.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d1c3be105---92759888094.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/o934gndegm1oc136aajr23o9p8/nefusewurolaje.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5e651081f1e3d15e1397057ff141f225/73754314878.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/43820667117.pdf
    • http://kyanite.tv/userfiles/file/84583030162.pdf
    • http://bighost.vn/uploads/userfiles/file/tevuteguwuweg.pdf
    • http://epoxidice.ro/mm/file/pelifinafozopevuwela.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83825322f---10032971175.pdf
    • http://evohome.pl/userfiles/file/14284124837.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/07bcc9bd9c491b18c2bbb40122962c44/40512266982.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210704_5EE5D312D7FC8417.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/bjjr2h28a23rk3413k3tvrh114/kilodomefufel.pdf
    • http://rolmech-strzelno.pl/Upload/file/48987492338.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=annabelle+1+full+movie+download
    • 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_off0000f586.bin
0b057b02831958a143f330c9d5f52aac5089adafb0c8e8b41561857a65d3e461
pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 16912 bytes
font_01_sfnt_off00012186.bin
4f11f38327c52742b0b24dd397014d13be44f04cfd5b496dfe663877c2703445
pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 10572 bytes
font_02_sfnt_off000139b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 16792 bytes