Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cad07c9563afd2…

MALICIOUS

PDF

92.7 KB Created: 2021-06-29 02:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44170e5698c5de0e487166418ef6c8af SHA-1: e50f677da768ee4b96b67dc5d9a06fe81e7b8eff SHA-256: d3cad07c9563afd23e53ef24400ae37d68fc3d7194c5d1ce6f319a68cda2e3fc
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 ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to lure users to malicious content. The presence of multiple distinct hosts and disposable hosting patterns further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://kanstm.com/ckupload/files/xavuzusadixefewegefipe.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/138f0fa5bb9155da3f415b73a4e670ac/73862474420.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abf671397c6---lonasijunonowaluja.pdfIn PDF document text
    • https://kristinanamaste.eu/files/16471474406.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3a5586a2df07cc014e35893eb86ff893/23039748255.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb376d682f---29267624557.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7d6bba437---59381966382.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/69707165522.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a2b6c3c1---paleverodumitem.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/72058672752.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af59ecd0689---68397134468.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/39083464471.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/kafanovuvabitufo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4930f75846e9b7bcc64e3b53a3e84c32/bogujofizegiboze.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6db1a498---fimudotijidenilega.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504044442160297.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1e8a7139c585e5d4317cb24c588b2435/47331509199.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf50e7d55---85908337420.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57df3e33c---55028914862.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tinujilode.pdfIn PDF document text
    • https://andrejc.si/files/file/wixufogorozerebelama.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b352589fe8a---61137395946.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/42e3d828c9a5912aba93ace42253e3d5/sepojaweko.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3685e68adbbfbda6893705a1532ee1bb/75592597395.pdfIn PDF document text
    • http://bwc.lt/i/luzivovev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cooking+carrots+on+stovePDF 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_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 17276 bytes
SHA-256: eb858fcb15553cf79ea651d3dc5eb5457d589913255a13f85b42754762608f34
font_02_sfnt_off00014d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D80 10548 bytes
SHA-256: 889de9623ff433cbf744942922d85499e5b551c1cf16a39b729e86a1ba6581c6

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