Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f846c4b427d013…

MALICIOUS

PDF

85.0 KB Created: 2021-07-13 16:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1100276c4216c2c7bf0523a5e3b6f267 SHA-1: 429a2a0f3dad08b08d0209a0b6a7ec3da56d0b2c SHA-256: 41f846c4b427d013484e36b1cffb9d7aa7acdf649bf7f03b78d3ff122498fe24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=a+hold+up PDF link annotation
    • https://armagedonspedycja.pl/files/file/tafinogotufeseduvi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/xumulurupuvejosi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2e7c17445478e00cd2d91e163d229ca8/92405512336.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/35611795902.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ac35i5kk459j1l5r460m7u8seu/tojuneluxunufewofupulubev.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/xoluzeber.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wafigewamaruwarirusajufem.pdfIn PDF document text
    • https://soechi.id/userfiles/file/19588697513.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/43637658632.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/n643q9q1pt5lubf8ro1btrmsl3/73770132993.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/nuxulotijar.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d79e0730b---jezesunifo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0048cade75---41047715569.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/89842265495.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/34189130189.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5affb7427---23298382756.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878393d55fa---15082304814.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/1128709966.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/23649150890.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/gubulapum.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/xizovezaxidoradosibuf.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/xitofosuvenixedobij.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fbuhcmc05dukkj3qltrbh809m5/vomikilivaxosuz.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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 9712 bytes
SHA-256: f63fe7957676f2c9a3d06ad856128356ae8546fa12b867a6a0ca0cabf8cf3afe
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 17880 bytes
SHA-256: 7da11900b127aff80d6039e9cd3fa84f1f313f520bf048974808e9d2f3c594aa
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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