Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d98b9593313973…

MALICIOUS

PDF

96.4 KB Created: 2021-07-02 19:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4426fe0cfc083354903d200308801817 SHA-1: 421c2a65dca27c5af4bf5d1d78e08c915d585ec9 SHA-256: a5d98b9593313973424211c832683ae325ca4d985e54c17e764aec9d8a0f0da9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting. The primary function appears to be directing users to potentially malicious content through these links, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://casentinoshopping.it/file/42441145810.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f13ed5484---gotoviladumolasu.pdf
    • http://changdahk.com/upload/musajuzusefejejawefisosij.pdf
    • https://protradingindia.net/userfiles/file/89865147823.pdf
    • http://cuatro-pr.org/sites/default/files/file/53630889634.pdf
    • http://moreit.ch/productinfo/file/mojizemanizibipa.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/bd099367cc54850c80da22062407230a/gemekujuritilur.pdf
    • http://blesk-stroy.ru/userfiles/files/37778686350.pdf
    • http://acpiindia.com/userfiles/file/66545665350.pdf
    • https://ktmcollege.org/public_html/userfiles/file/lizoxekurav.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/56689599970.pdf
    • https://unosms.us/userfiles/file/64106956221.pdf
    • https://ikansambel.com/contents//files/29275353489.pdf
    • http://weberstellen.ch/userfiles/file/pusaxum.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/luvuluvo.pdf
    • http://bachova-terapia.sk/images/file/9511848539.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607402f05f099---dakobef.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f6870233---nimawepa.pdf
    • http://nuovartea.eu/userfiles/files/29690658123.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/98479385055.pdf
    • http://cnc-soustruzeni.cz/files/file/panowapelulabimut.pdf
    • http://miltonhigh65.com/clients/874455/File/lesarowofabawugug.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/76044783664.pdf
    • https://accuratesearch.com/userfiles/file/12394975732.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ancient+assyrian+religion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011576.bin
21c6e8292def207367d52721dc9d4b97fb1a506a317ab91a2741646dfcfba5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 10500 bytes
font_01_sfnt_off00012d8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 16792 bytes
font_02_sfnt_off000145a1.bin
9133e453aabeaf6b7c0cf7389547df38121cbeaf7aa014a6ea2bb3b0244d0e6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A1 18372 bytes