Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba597381e3e8c03…

MALICIOUS

PDF

96.8 KB Created: 2021-09-02 22:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5a1ff9bd334a04e037c383c71420cba SHA-1: 097da8206a3d152d0a8e89ae45b74197c166e70e SHA-256: 5ba597381e3e8c030a82e47d6bb98381564a83e48052aefa40e955f3d58bbfcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The primary attack pattern involves luring users through a seemingly innocuous document to a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://varbackaforskola.se/ckfinder/userfiles/files/xavum.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b307ba7e77d---bikidigubitagapubemus.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/volukaj.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/mavitetedabag.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/13617961924.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3eb9ce18f---gemipodibut.pdfIn PDF document text
    • http://www.bash.cl/media/file/kibogikegigutokob.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4508f3b819---xosasizukubik.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7688f89e89a0ea894841c84b77385e54/didepipobopo.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/gijadizijumavibo.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/farufifewifole.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/26381140515.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca4c3fbb6---lupupivoruzakijewudon.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/99502288919.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/77843024905.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7182852977aecd042eccf653b9181166/81802397460.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/37424277077.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/67336996837.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/3c1n32q1aqlv47gakho7q7gf37/firaxulipet.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc6169679a---96924117029.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0f46a6c21767cb38db03c6eccba36b5f/60624251136.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b4c32e0cb287d53b01d7c56021bd89e7/74154495530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=common+spanish+phrases+travel+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_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 10860 bytes
SHA-256: 1e4dbc89352873c1a3c274ddf73c556afb71777654babbddf0bcd5d55bbb6b98
font_01_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 19724 bytes
SHA-256: b6dc7448ca912f875519d34d11f9c952fefae4f7f66a174da26358eb1d498318
font_02_sfnt_off00015d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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