Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e65f6f9d75bd89c…

MALICIOUS

PDF

78.4 KB Created: 2021-08-31 06:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6769949a28336b2226e456ff28712e08 SHA-1: d3d534a31d09483ea52236e3fe9b26498251e9e0 SHA-256: 8e65f6f9d75bd89c1e36a5c26c224b866372431cd847c7735a0ff91c6e0e56df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://huntic.ru/uplcv?utm_term=penthouses+magazine+pdf+free+download PDF link annotation
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/41561872033.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/64773665080.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/03d3808e6f69b3aa380f10f330752e15/notafatipofotitozifav.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/95m7ngvdggsq3n49tdlfnoteh5/kaxibejavoluluvesi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d77756592ab---zovetadakifuvajotu.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/pujatuvujedumow.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5bc795e1---77431533016.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56045e5524---sakut.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bojejukud.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/37085008469.pdfIn PDF document text
    • http://donghotam.com/luutru/files/55093950639.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/38697260247.pdfIn PDF document text
    • http://plncse.hu/php_data/file/17433461662.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd846ca6224---78492382368.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9908a47876f77f410854ede095fa6f6c/42685863263.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0997c2cff---12508663754.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff8nk2cnptgdiac9k502orl12/dumovavakekirirupobazipix.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7382e31d9f---ranesetijuke.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/valoveg.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/qrsoor8ca90seskqbnbtrp1b8a/luzevu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/felodekuxixeja.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/68448371072.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e746c35cd62e6c0fb9ff04aad74d8156/wizuvedukesumejiwiv.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f3722fe644bdffb532117b6506ee5d82/33058874978.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/padofigosonifekunekijawik.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/xafubi.pdfIn PDF document text
    • 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_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 17224 bytes
SHA-256: bdb1bce88df99f9c6cd2e48e1430cbca91bb6f8740433c1321289ecf02e8da07
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 11192 bytes
SHA-256: add498f5545b1807633219d6ffb6d6cfb226db32a8e1d7e51f3984d5cfe6ae3b

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