Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe0424080746b47…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 13:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97abffb553845d42a1d68f56e248802e SHA-1: f9bfc94366d25f950cbec39e3b0975ec89e47ce9 SHA-256: 2fe0424080746b476ee7996ae83dd8f5092603feb85e09bba7aae43bcbb6ea06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the presence of numerous links to potentially malicious PDF files indicates a lure for users to download further content, possibly a game as suggested by one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://saiprogetti.net/userfiles/files/12997762936.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9e07c019---bololatedavilixo.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/aqi4dqi31m7pco8s25lndpjgnk/wosinagodukon.pdf
    • http://desushibar.com/userfiles/file/gesixilu.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e69aa026126a454bfc4a3854bdd201a0/94615118061.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/01iath20m0tnutuhu8t3eoucqi/13706335885.pdf
    • http://aldo-ins.com/userfiles/file/feselubexejirenisiw.pdf
    • http://tuanlongland.com/upload/files/64705035282.pdf
    • http://amirmazandaranihospital.com/ckeditor/files/files/kokekalexumatuweruvuvuf.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/rogikujugolonajifok.pdf
    • http://studiosiriosrl.it/userfiles/files/xewukeduwiradopi.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387eebacc58---terupinox.pdf
    • http://elfobchod.cz/foto/Image/file/84754713070.pdf
    • http://ustunongel.com/image/files/3010404105.pdf
    • http://champaigncursillo.com/userfiles/file/bikor.pdf
    • http://remaining-mc.de/userfiles/file/17109922124.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312d067074a---zelalerexajutoxowabejax.pdf
    • http://ehomerealestate.org/images/file/29586354787.pdf
    • http://gmicropilotes.com/uploads/files/47828820771.pdf
    • http://sushimura1.com/uploads/files/45889626108.pdf
    • https://daiichitravel.com/uploads/news_file/65043078140.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/titizakuvu.pdf
    • https://hnhaa.com/userfiles/tnejp/files/mufefu.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740b4923ce---92735130318.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141160f767e6---buzagovofam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=insaniquarium+pc+download+full
    • 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_off0000dd39.bin
57fb902cfbe30a9a35d6674a95e1a9c4c0311dc2163c373da259a94e984c4acc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10836 bytes
font_01_sfnt_off0000f603.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
font_02_sfnt_off00010e15.bin
cb9c83f58e186d27edc3e2adc56d4cf4275c5b676962e292fdcf77580126fbf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 17628 bytes