Malicious PDF — malware analysis report

Static analysis result for SHA-256 f625fe8da52351c0…

MALICIOUS

PDF

99.8 KB Created: 2021-08-17 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 387c1d08fcbb7fc553c4e400e1f150d8 SHA-1: cb56a70094055bb90a89a9a124b6c89cc1bcc6e3 SHA-256: f625fe8da52351c0447bb3e8db58e45692d2a6fb2fce0b70bf47e8aca414958b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning tactic. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2uiv1lv6jn59023na70cfrn6q1/42562008586.pdf In PDF document text
    • http://copy2d.com/ftp/image/file/dirarimujununo.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/a0dfur3noblg3tme4qjb92gjjf/18046006661.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/pododuba.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/kupolujurifufolowawiselog.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/95007260886.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/jagerogudelumewigiza.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/36495805656.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/fugotazajegexixawi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109915238260---89235631165.pdfIn PDF document text
    • http://sport-way.ru/img/file/99950854080.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/wilovomibebelovuralunamo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8be224ae0---jolaz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/92187e27917bb38238b3d18be5da08c1/94518437342.pdfIn PDF document text
    • https://ksuskalology.com/images/file/dejimosomomovu.pdfIn PDF document text
    • http://cabini.it/userfiles/files/4291763093.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/79973970573.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wojifeni.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcf98714b---47449894849.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/vipiweloxasabe.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/noluxezenego.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/2321973285.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/sajusosulojub.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160900cc29ade9---besexotedifomoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+ppt+intermediate+accounting+kieso+bahasa+indonesiaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 17840 bytes
SHA-256: 31c3914f308d55270df4c0f2efb67ffab926df1f96c8985faa04391057010ed5
font_01_sfnt_off00014db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB8 11380 bytes
SHA-256: cd6f38f68381186d659f59f359685f2ce3657c207b6eb7cf6dc80e5ef046e66b
font_02_sfnt_off000167f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1