Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f317549cec17d35…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 15:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9681acfd53ddd6efa042e77df86f9adf SHA-1: 2fe74d13039eec5237d25fa501e541384c7dee60 SHA-256: 9f317549cec17d35beccbe2e27d43f47731719d567d34133e7e19f388ab8addb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://goref.ru/files/file/vuxegozox.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/50a28e463717ec3f53edf911997b5020/91916300200.pdf
    • http://antifftech.com/uploadfile/file///2021051723221956.pdf
    • http://jinohair.com/upload/files/zimalubofotasejivimovoj.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843cf97ce61---resixoraki.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/bsfijsmo2ddas2a04aq4q4kk2l/bavakevugoron.pdf
    • http://abpaluso.com/upload/file/jijifinuzisexiponere.pdf
    • http://utuin.net/files/fckeditor/file/52526639584.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d29f702f9---gegavitogupatubobus.pdf
    • http://avsa.org/sites/default/files/images/files/jeterawoxujenixapisixigok.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa7e3d23b---35077137554.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/701a2d3c39e9f2340fe11da8eb7bae0d/saxazas.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160860f7cf3725---60243238447.pdf
    • https://grandplaza.bg/uploads/assets/file/penewigeregodetava.pdf
    • http://melly-incendie.fr/img_db/gazan.pdf
    • http://amuseonline.com/absite/userfiles/file/48214699609.pdf
    • https://aplusadvance.com/naver_editor/data/file/27457645632.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22deba6a16---55291026824.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69ea53d1f---34229091627.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4647c69d---tulovu.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8k7lcb81fegruc4fljbvhjj1d1/95172263224.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/1hpe45vkp78i556r9k35b6bod5/88382554575.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/862b90284955fe7c6ad2afe19c385146/birixovige.pdf
    • http://mea-travel.pl/userfiles/file/31808582285.pdf
    • http://leton.pl/userfiles/file/wuxobizu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hydraulic+jack+construction+and+working+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_off0000f440.bin
ca13545a8cff5670eb30cca7d2a874eff2320ec7ab85f0238557d22eeab74a86
pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 16480 bytes
font_01_sfnt_off00011f11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 16792 bytes
font_02_sfnt_off00013728.bin
6888787d8d236cecf166f1a22c9a2be5d072192d8f0369b30cdf7d4b57498749
pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 11176 bytes