Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd08b75b0b65226d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 07:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9dbc0fc2470254f64bcced8c6879c47 SHA-1: e576f2ff700f9574d9a705a5e8095931a071141f SHA-256: fd08b75b0b65226d6e994aaa780c218018f8bbee73d1d52992b2ea8ff3e8e4db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious destinations. The presence of link farms on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wastran.ru/uplcv?utm_term=como+bloquear+mensajes+no+deseados+en+android PDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/06ooivub4a4obe6j20gouctmt0/jezovuleragoku.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c4655878---nezozajinezufafi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/63110c9cb24a59be3b921b18cf5d4328/xarodotul.pdfIn PDF document text
    • https://umartravel.com/files/sojisefu.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/pojebasi.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/kapobuzifiwugujaxav.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/dekigomeg.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e698e9f4b---49946797129.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/54062980325.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/37512267062.pdfIn PDF document text
    • http://sjanzee.nl/file/61735259478.pdfIn PDF document text
    • http://northcity.rs/slike/files/kututetoseriwo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219102013131933.pdfIn PDF document text
    • https://duvanco.be/docs/files/dubizukuvudonutabik.pdfIn PDF document text
    • http://freeorden.com/media/file/45516194923.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/17117793565.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/wodovev.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/rufotumalebe.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bilitudurimobise.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/bugiburu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/70990111880.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136de187d231---73029608844.pdfIn PDF document text
    • https://network-italia.it/file/53176385193.pdfIn PDF document text
    • http://vhz.cz/user-files/85078958192.pdfIn PDF document text
    • 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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10856 bytes
SHA-256: fbabab215e2c7626dd80b03d49040ab44f4d06dbd0158a2a3af0b754b43c4f33
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 19184 bytes
SHA-256: 624c6c399e464ab0c8f1a60c5015d57d290e612f10a98707300b4dae1152aaca

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