Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97f834936306528…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 14:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e1231ed56ba63d24a276694544ba51d SHA-1: 4f0259a37b6dfbaeb45e7343ca4cccffaeb072c5 SHA-256: c97f8349363065287bcf7042539d59b169d91a9ed162c44aff24cf8f8d27b8d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which are associated with compromised content management systems or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=psychsim+5+expressing+emotion+worksheet+answers PDF link annotation
    • http://visusmarble.com/images_upload/files/33968686339.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/33710115337.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/rosuzugalox.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/tovekejunafejuzubotuw.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dd891cb13af2aa2f4b6170c482027f2/xetewimevufuburene.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/45863302157.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/zitedilene.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fatekowudax.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/vorajevanukugazebabimo.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/55090218113.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/85363362639.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/72804139666.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908025008522331.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/jaxuparatujosizarafa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613379ba89abb---kofexukeguj.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/taniwefikuwitavezeluja.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630545277.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/riguwewozilenolilaloxep.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/13696278881.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcfe4971c---tamidazew.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/18189166074.pdfIn PDF document text
    • http://dytac.hk/userfiles/78237528774.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/dasexarubudirul.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/foriradukusagabuwuwod.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_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 11304 bytes
SHA-256: 023fd98da1a9f746cfbaae0e8a39c839fc44c39f1a397be976b696b77301f6eb
font_02_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 17608 bytes
SHA-256: 27791b5cdedf8cfad272c47076bc9eb95ef08bb1509bc73979dfb547295dbb0a

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