Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ed7497f7396a78…

MALICIOUS

PDF

72.1 KB Created: 2021-07-07 21:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76e898772281dffcb9f650c7fad97280 SHA-1: edb28b328ae98ebf2c6cc0eed45e468b4a920881 SHA-256: b5ed7497f7396a787fbf2e9b6e7150aefafe7a6c2b02c56c4bafc88d743eed0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7307

Heuristics 5

  • 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
  • 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://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93261477538.pdf In PDF document text
    • http://effektfilm.de/files/file/86729171827.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe01737c04---3698893560.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f9c38eed---36080221802.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/18867f56cc67d03e3de41e9f8c018097/19601778577.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d78253261b331c5afdb218d6fde07c39/gevodazelabukonu.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/dabubameremudinu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/52500555293.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3d92e80ed566b5fb0a6e81f6df035305/kabuwewixuwupizimusopo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e4543e6a---26196510783.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/rapide.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b380c2cd0---vujef.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921b7ac4082---fubejivodoxigu.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/17061403214.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/woxaga.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/zijofirexiw.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/fdjle928dvgmc77tn7q5s6abk2/kujozakudifixolarawi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/37384789389.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/pamej.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/89472503157.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/galumi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/59349995176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wait+for+me+kings+of+leon+tabPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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