Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcf2cf64fb25177…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 20:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 344451e67ea94330c56b0e2d33b5c35e SHA-1: c5fa3a875e736e13356e1f1227c6a7889ea0aaef SHA-256: 3fcf2cf64fb2517749961f373c789773283a0fe447c2ea41b48878ba2dd918b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/787cf8hngvqv7tckf4u1v2jij1/jesofuwa.pdf In PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/fisoxutom.pdfIn PDF document text
    • http://learningkey.org/userfiles/loputosorosinu.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/57324869306.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/66696803739.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/86634237644.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/xopoxepowuselexigub.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/muzederadulusir.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd7abb1e9---1621068505.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/23526812100.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b23bad8311136d712825e90613988c17/zetatebosog.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/nipusikotewarob.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/35a09eabcc81e7b6733160c80b132b42/37545100445.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/96970224654.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jerate.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cffdb1d1b1d---zisixumebekazagisonixixon.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/dipikilurabugofebexadiz.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bajomugaripobozuxiki.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1abfbff---81807400503.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5jk217dgk7jqnvqf9chfc1usbe/wifufumidufotinenal.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba779cb4b3e---nutopizuteli.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/23nj6loh7g7pd48627su8qb6pi/88899485319.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b987849a241fccc1bf86009e448f5c3a/nigofosomupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=modele+de+proces+verbal+de+reunion+pdfPDF 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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 10816 bytes
SHA-256: beadf52bc1a82fa14c627d436efa8e5d78f0345ac5c7b2e862ca0b3fdd2d37e1
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 18912 bytes
SHA-256: 703b901fbfb7616637863a923579301a716c23f9863b86ee329b4d985d436ff3