Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c087405166f03…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 15:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5978566bba66962ff99a747e6aca3c2 SHA-1: 0d07602e99b85f87d280c91953ed19c83a1ea4e2 SHA-256: bd5c087405166f032329d97aa8aeed77e35210aab84147beccda8cf69b9fbeea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://artecgroupservices.com/imagenes/file/sazazobobuwusi.pdf In PDF document text
    • https://diaochue.vn/userfiles/file/moxegaxuvizimal.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/koxukutu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160774acd9365e---5767306952.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/widivokotutid.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/32958512370.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gtb5suatskcn2i15mlpmh8cr4c/23409328038.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/zekoluzafuxizusuz.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9da0ee92b---80897325651.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/8891219266.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/75860877341.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/10007785154.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pgsl1j25f0cl4ippahmt4c9spb/jalosiwuwekilenunu.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/daniket.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f69cef05b1a843c36caef0dbe10d2da0/65236761154.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/37248980912.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/85433084038.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/87650479922.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e949a689e---79576916721.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcc4948df1---57768197010.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e18aa65e278f066597fd70f37ce217d2/61065695002.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/10550457139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=when+she+loved+me+tik+tokPDF 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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 10400 bytes
SHA-256: 72984a459568e12da9db0a175a109cb29fa74c8235de14a5ca15cfd60e4a8a5c
font_01_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 19596 bytes
SHA-256: 7db2755fac2ee92e4da4ba921dff15a485822ce067e588ca23a022561f243cbc

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