Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e36e16ce6c5832a…

MALICIOUS

PDF

105.3 KB Created: 2021-07-08 03:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7384c78173dc945dc39ddc6047eef2c0 SHA-1: 7ab5e3540b805ea17c5755eefb709caf790c2637 SHA-256: 5e36e16ce6c5832ae6a069cfe5c5863258f13d61557e92887b41967ab07aa60e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bd71fd6c202154877ccb6e5dc07341ff/64032689969.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1eb6d265d---sorewufovevofaf.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64a1006d0---wutenezonozavozosapovon.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/020e12e8e0499c7b17178630ff99db57/90886609224.pdf
    • http://smcertificationservices.com/userfiles/files/76981629219.pdf
    • http://www.pattyn360.com/upload/forum/files/49760279854.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1640c2310---26540437282.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754da33393f---palavekomujabi.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/77180822336.pdf
    • http://doo-san.com/userfiles/file/20210623034631.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/zejotem.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/dosodigunejumogida.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9969e310---13239858316.pdf
    • http://www.odnpoznan.pl/fotki/file/file/nitadupovod.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a95381ec8ba---lurivegizunodogax.pdf
    • https://langumeistras.lt/i/File/40874511212.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/d36a6usofi003ou2v8pveh4v70/82686349731.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9d273c5b---mazigixowesama.pdf
    • http://alhouti.com/userfiles/file/42149923684.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819092e385---velakejazukabokonigefokob.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2ba7f630308bf6ea0167be84380377e0/17814796186.pdf
    • http://ducthoaudio.com/upload/files/mimodafofoz.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xukax.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858a315ca25---44194402634.pdf
    • http://xenangheli.vn/public/files/dikulo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=after+effects+for+ipad+pro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f173.bin
f6b2ac71918f982c764f3f9e71702dcd06249b617d74667e634afd0af09615bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 28648 bytes
font_01_sfnt_off00012a3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes
font_02_sfnt_off00014251.bin
a184ef63b40343bb0ec082d7016619ba1067d62dcc9d89265200c51cd08e84bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 10444 bytes
font_03_sfnt_off00015a29.bin
07c77d790855648e86db820b2d841c8d67f202fc02b69571ae52a34cb742fc15
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A29 21392 bytes