Malicious PDF — malware analysis report

Static analysis result for SHA-256 67805829e00c80dc…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 02:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29826b5abdd193c7fa9f5d437bf04d9f SHA-1: e353b49cc19bfa2f9618847c7fafb81ac368644d SHA-256: 67805829e00c80dc8f805e585f383e021a4bed1f8a2684a8ae496357283e7b38
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to various external websites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.997504 strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues but reinforcing the nature of the embedded links.

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 http://churchtextile.com/userfiles/file/mugedi.pdf In PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/92910485788.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/75016879324.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/roxeliper.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/40344239151.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/javipoposujasev.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3fb7eb279c964c004be11e7690d3e07d/zozob.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/62537330215.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/sugomepunatovadifedu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/sasilogajes.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134817816bbe---pagopuriveduxigotaju.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cd7dbfdfc80ac666aa31e0deec0863ec/19936552005.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tefirigarunesetovofez.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/sarekudimamep.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/80553091652.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/90700046745.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613add2f94574---zokuz.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2da41c69a4fb8f5d398e6abaa9cdd70a/dokumekamilizese.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/tijobuwabakaluvenejinuvo.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/46369420766.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/87538418452.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/vimogugabiruna.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/wojub.pdfIn PDF document text
    • http://tradotel-riviera.com/file/81061963076.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/36553210388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=play+store+top+downloaded+appPDF 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_off0000b3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 10492 bytes
SHA-256: 93479bc9e8324be2775d32db303a27f5b008dad09e74b37d1ce0b7d4ad53bce6
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 15720 bytes
SHA-256: ff3dc766ed4952aad2c0ea826bae1e81111daba1446ed290132ceee119084de6
font_02_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1