Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8af1539c9b6fd8a…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 17:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f20817b4d93576a0017245d79c6d47d SHA-1: 3285a1af725b62d13a659adac90c05e05717c98f SHA-256: c8af1539c9b6fd8af52401ba81093c1b825d434c9aeffe03b4aec3a588fa903c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://4x4autok.hu/userfiles/files/74150171082.pdf In PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/pomivok.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3836c371---58456679365.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210628_061402.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/xodofofatafaxab.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/zuwes.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1593a1e7---94923731333.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/13146031216.pdfIn PDF document text
    • http://kite-surf.sk/files/75125306421.pdfIn PDF document text
    • http://jarosi.hu/files/file/69892371671.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/80385651692.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7add9142e8f3288f8b4285335d201df8/gofawiramafoviwekizij.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78c33c647e---77045399746.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/48260330028.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16127058d805ca---95267775286.pdfIn PDF document text
    • http://apsons.eu/files/file/pavojuvorugigaguxupomed.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gupaselunitaselebowupu.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/ganumugixup.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8367c57b8---39048739055.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4ec19904fa5096055a186dfd69c55cf/fidedux.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/e60kef39fm0vq3oo27m724q00s/rejagozen.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/jowipopupus.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mawipebobudiburet.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/fewawitoboliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=taller+de+escritura+de+cuentos+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_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 20360 bytes
SHA-256: da8c2095ebc7fd5d584b245f5374e934159dc2fc8777f397f4b3c98c7477026d
font_01_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 10676 bytes
SHA-256: 3193888b0efa91ba47bb70ae9fe4835b09e7fb55bfee310b129020315b9ba4c0

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