Malicious PDF — malware analysis report

Static analysis result for SHA-256 690204140d154e9a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 10:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a55f210fd48371f2e8b844cc091fbc97 SHA-1: e650b58dacad940ea1233fe2d0d0c0990fe61cbb SHA-256: 690204140d154e9aadea36013f7e7220127d19ffffbf7c67232b3d9b19b5063a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa9f879ab---fenupatolutonekap.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e48819bcc798efb51da1ceb87f9b12f/wasusutumagupibasuvarosiz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/11126b15d268ec2d1ddc7099dd5f4e07/kukumitas.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/94804508079.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jepoziwifebedizugig.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/151c129086ae654dcdd60666e75aaf90/risog.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/68828742301.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v11mb361idsld4g9b5ilrb3qov/batuxe.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609804bb068be---rodewegunusowizeju.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/leladezidibu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/25975162030.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/87708472284.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/17699630415.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12302499897.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///73855537528.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f83948c52cc---99747332078.pdfIn PDF document text
    • https://parkettworld.com/upload/files/11520636553.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1644919148610037fa66539.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e4fb07f4661905d543d79fde306de9ae/2559076929.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16120328967e5a---donoranulogutawefax.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc08300f89---85531327828.pdfIn PDF document text
    • http://citra.cl/userfiles/file/damozubimesiwagawu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b80d1d375---jipali.pdfIn PDF document text
    • http://bronia.org/userfiles/file/70129811746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=static+constructor+in+c%23+with+examplePDF 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_off0000bcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAF 16564 bytes
SHA-256: 82e493a341d4ad4c61a6f5cb82d24f635c5954955d9be84e88f16158b28c3e03
font_01_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10220 bytes
SHA-256: 52f5bcf92cc5d6b37ca971d39791b822fa49055bfc5cc29603927f90b9f0ea0d

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