Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d2645411e70d42…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 00:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58eefd38b78203faf3f709fb7c719bf5 SHA-1: b768797c67b2f59d66549b5768033e5ca2ebaf6e SHA-256: 65d2645411e70d42c61df48061e6d2c2bba30a0cdea2d77163b53df5d285b0c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites utilizing compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves luring users to potentially harmful external sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/aa74a6d11a0c1c93aa0da8965f1ee598/xuzizeba.pdf In PDF document text
    • http://lacasedescaraibes.fr/file/difibegemusosujuvomipir.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/b7c432a2705ef2f74bdb8bb8fd34aa88/95942258388.pdfIn PDF document text
    • https://aromamarketing.md/img/files/61993199351.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/pakow.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/dorowole.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceeeda4419---29710183317.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/3565140305.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/juxebelekefeb.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/zenenitogixaxin.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15dad4dccf---83944043257.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6d6adcee---nitorelevetis.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/38511834518.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/rusevuzixowurazonikumi.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/40477309611.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/76966981560.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/17825608737.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0d753a1b---47408856215.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/xijinararomokadepa.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/51223125606.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb7e676cd---puvifoxofosipudi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/4155891798.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/tiwodibukamidaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=grammatical+errors+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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10716 bytes
SHA-256: 3d8ea380e87344206a123a06040a5c6ae5abcdbe491ca3b6d46f63d21a9097a6
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 17552 bytes
SHA-256: 1f675440e96925360ff06f096ec48e14c759d2c547f358f35ea165a299e28ed6

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