Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0823cb07d995c9a…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 01:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdcdbd7c35c37741634ad3c7c1bec8d7 SHA-1: 4a6068ea9b495696abc038531ec4206a246255f5 SHA-256: a0823cb07d995c9aa54088501c0dbcadbe041923a5a7e1e756fe41fdff736612
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or exploit vulnerabilities. The primary attack pattern involves directing users to external, potentially compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a64aa9d764fbe029d97f01fa300610b3/76030583408.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd50fae269deed40ea7fb73d796dd954/75232399428.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027876d3c1---vatewafigo.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0763f8f6ed248804b41d7200a7460748/gegevakasegogivananifagu.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mlk052nrl2i9dc6244h6gd0874/nufebe.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095e37a6d941---fuxividiwatoxowal.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab837b1777---zepikejajiweka.pdf
    • https://careersourceokaloosawalton.com/files/public/42860983727.pdf
    • https://torbay.ru/images/uploads/file/21276606067.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3318f3f2---xufifobefujisaxoketulod.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8d149db947df514c84933468affaf06e/94451129351.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/br4prba4k33sjrhfr84ul1dahf/28895912552.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3d8a4dc4---latadivulowadutejanex.pdf
    • https://tsegypt.com/file/nubor.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e76252722f---68080035046.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a6aebefb93---26194152341.pdf
    • https://minhkygroup.com/luutru/files/gipibosuz.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084193e3cd8a---6732426733.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17e46421f---70368657135.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/94520063103.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609475df50678---88681158661.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a385daf9---25291201954.pdf
    • https://whitesal.com/data/images/file/1141_20210610090629.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+draw+drawing+and+sketching+objects+from+your+imagination+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7ff71ba10fc5bfebc1cc3eada2f00a86/kufuzeniz.pdf
    • 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_off0000f950.bin
5674fae8f721c4fee10a00d9948759303dd1ab8fc3029a4c4f84580f61d291ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 17432 bytes
font_01_sfnt_off000126cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 16792 bytes
font_02_sfnt_off00013ee2.bin
e02f1dad977653acbe97737f4b0cc3805a6f097e9425202e2e73701def65f4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE2 11676 bytes

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