Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e249ba057ade8b2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 18:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: afb1d35f65413c5d2972979a8bcb8c28 SHA-1: 84277b1d3f3711b6fbef2a0aa06e4864e30ad134 SHA-256: 7e249ba057ade8b2b14532040546e34775022f53de5b0b27f2c9e9fc097020ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=green+and+yellow+things PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6f8e7705---pevitusigu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fikavokeralokowevudev.pdfIn PDF document text
    • http://www.asslar.de/downloads/boxuxadasutisupimipar.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/waguworebokafenubarozeseb.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/85566147175.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/79782945553.pdfIn PDF document text
    • https://mavibusiness.it/file/17276796597.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/68343095445.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/raxabaxulezitiwava.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/dac4fdeefc20e1056285a4e78d7178fe/tepenafatufat.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/75032744016.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/49451994113.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/titudumipemixawoz.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/4742722781.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/27165426616.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210630115320.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vulane.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/ragajusogexelug.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982d8e52651---6393977714.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/dower.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/45035476760.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/modokuvipavikogi.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/todimavujitazobos.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b8c9c337---sekunowevepesumajovazo.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24234557974.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/gofop.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_off0000c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 10764 bytes
SHA-256: 3b2450a83d2acf4aa493560f250e5f60964c47fffedb73efd445ca8ab932bd0f
font_01_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 16916 bytes
SHA-256: 87a10b4d176bebb86082c33ba29e09c82831f46c2ac278e6ddd3a719391196cd
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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