Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2f38dbf1af6789…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 11:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7c9ff62571f557cc248c67dc21e32737 SHA-1: 658eca73f2d9ef4809d92816791cd1543d4f968a SHA-256: 3e2f38dbf1af6789d4f18e70c91ac87866bc8a5ebbf60ac1bcb1cf47d46bf876
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.aicsmindia.org/ckfinder/userfiles/files/semuw.pdf In PDF document text
    • https://mama-light.net/business_school/uploads/file/defodesuxunifikuve.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/20346773940.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613828194aedd---43730970728.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/12651387762.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/tiwixubebawugevefelanojef.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/28110460169.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/42651330187.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/bagabutisozesaduki.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613992182bb09---tovujudasepuvifinurol.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/35843204884.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/17218286837.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386210a238c---76128292687.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/567acf0a708247b878ddef9fe76e6e59/31523689486.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/30325743492.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/muzepuwosujumaj.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161434ef12e22f---82002728458.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/labepogofeneriwikuvopobob.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/vakugidivabesuminab.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g8juveu2p5ra4k4t0h86m2ol07/zuwegukaxabaginenenasa.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/98637599563.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0ec201a4---34337024959.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/91617479553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+film+indirme+siteleriPDF 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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 10336 bytes
SHA-256: 7e35c86abc3c8ea5f814ea51f27a2570fc392afa33c2f7555ea503044d1b66fc
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 18240 bytes
SHA-256: a274c138d7a0e2448d9359f5e7bbd5b515482c591f729ee9f85a8035ce56c0ca