Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc567baaf9cc5d99…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 15:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 946479bea203d55c640f9cd0ed1f732c SHA-1: 08e89731570e42c55c1726f46d6afe185551601c SHA-256: dc567baaf9cc5d9917e14a28ac61e3ad0b97e12c42dc9ab3782c95d67530d3cc
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The malformed stream length heuristic further indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/tegirel.pdf In PDF document text
    • http://lyzph.com/userfiles/file/Fl202109010805312833.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140794e5cc71---43190726559.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/nekoxejotidapi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/gezivozevitizero.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/919b66852128a5a9567e348ae7ea6e64/mozugetebazakare.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/60733044147.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/rogasofafobukunupewuxakib.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/26422626027.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/monogusumikuwe.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e8263eef---puledarurawuzudamabux.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/lopomexexenebubi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318beceb5e7---garutevawagekawew.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/duvedijekaxagabusatakope.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/19229446468.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/60305111235.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/10582986251.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/zosum.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bb02be6b7992701623d67e061dc20fb5/81340667518.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/gafafavuxowaxekirokali.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2912a22f98cb0bf302d02d3055d2cc63/xesuletutafison.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/44468348236.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/84596774454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+game+door+slammers+2+drag+racing+mod+apkPDF 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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 20440 bytes
SHA-256: 0097146b9ad6d17851786b84eb725c7d2799268dbe765886cddc9f2d5d3a3675
font_02_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 11056 bytes
SHA-256: 0a68d0d72f6b4fe86a592eb0388cdf6ebd4b843e1aa66685108ae1b547d20b61

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