Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f9912126b13f9c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 01:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03629fc8173482f3976837245986559a SHA-1: ef7fad4d37f398369979a8423508933176356e3c SHA-256: 15f9912126b13f9c26ed32c7e4bbf0f1cc484d5c9126e9742102893b07c49bec
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://psihodesk.ro/ckfinder/userfiles/files/babopulilijojol.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765ffd5cf4b---libujipovelupurutobep.pdf
    • http://cuuhoatudong.com/upload/files/56933784570.pdf
    • http://corporatiegids.nl/uploads/files/pakobuw.pdf
    • http://dansensvenner.dk/imagesfile///87672786878.pdf
    • http://veejaytechnologies.com/userfiles/file/25806277833.pdf
    • http://doubles301.jp/files/ckeditor/files/pasukegumobikolib.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/lumapesoki.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3ea517d1b3f785061d687c8feba768ea/fekelafagoki.pdf
    • https://webmakler.org/userfiles/file/38072577563.pdf
    • http://chobacgiang.net/webroot/img/files/73973121200.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a22e03430647cf03f2d5111963852cae/pofevukelekobusilijoxakez.pdf
    • http://praconsulgroup.ru/pict/file/89671100487.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/adc0b78571d5e3c67ae57c2bf5904883/74841151929.pdf
    • http://www.siposferenc.hu/html/15377063287.pdf
    • http://isystem.hu/ckfinder/userfiles/files/golawuked.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f82e63aeaaa2411b0f569a719914aab2/94124756772.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae4eead042---loxip.pdf
    • https://stiff.pl/ckfinder/userfiles/files/87779551060.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/50193c6bbf21e125611f8aec3bc215c8/80057313263.pdf
    • https://isleo.com/i_photos/file/5218076367.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71bac7d076d561f22311bf69be74d4d3/51537496877.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d63c306b130---96312945407.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=french+reading+books+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_off0000d97a.bin
3b368233eb6c26ca5e108f552eaa82f599e17d1968f22082555fc196928a8520
pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 17480 bytes
font_01_sfnt_off000106c7.bin
1b568d984fd133865659631a7920d320c1f7e95cec6abef620ba279a08470bde
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 10964 bytes
font_02_sfnt_off00011fa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 16792 bytes