Malicious PDF — malware analysis report

Static analysis result for SHA-256 04618f0b4ef8ce56…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 13:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14293e6dd3cd8609b2526b753251c6f3 SHA-1: 9f350f321cc027bf4cd2bcafe3c7279f9be242f7 SHA-256: 04618f0b4ef8ce56415e58e8290604fb7847e9f44ef53cd97990ef542a028723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cs-nippon-cp.com/mailmagazine/upload/files/71657464895.pdf In PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/waromonexekitubixil.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kurakitirexiperudelijis.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/51422612622.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/wezixagizaloxikinetuwugu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/kamitewaneragaxojapudega.pdfIn PDF document text
    • http://vtaky.sk/media/file/rutabazi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/01783304ed04932d139598ff6d82177a/53985248939.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/24b8e8afe3be910756658f608b98870d/jezenun.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/16082976487.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/90154639587.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1e45c1cd---pevolib.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/naxenumideruvujinid.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/pusorikiramutile.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/604ad2d906362ac693eea9b1b274437f/berupepitosumadidometugaw.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/lijotalagibidigezes.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/pobetanewegezunemej.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/lijododerevovugukenaf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5bb9af404b2f12a77bb7ed34a7e4eb24/sekomojavepipuvufujogox.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260cb83b9b---81838593507.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bulawoguzubaxudeluxavaweb.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/42334115243.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/pefutilanifegipox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mario+64+unreal+engine+downloadPDF 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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 17340 bytes
SHA-256: d0b81afeb6947e638beb39bf278b7ce5eb5bba1f7e76f76568d1ced7d23f0614
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 10584 bytes
SHA-256: fb06b93054ccec99052c4c302c0e3ab3c42c642882d0b3549f9b2d509752d6db
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1