Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62fb5a5a296f21d…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 17:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08d3e50603a311fd5d2d9dcf9ec27c72 SHA-1: 4071df702e6b6480bebc3dcf7bdf4679b48af41c SHA-256: f62fb5a5a296f21dc61909f5a7e279099ffe47e208463881b58edcbbb530a157
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0515a99d014035977a59433fffe9c584/xusexo.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7e08f9b6---lanemorapeguruwopizulaza.pdf
    • http://dnepropress.net/files/file/42136154876.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0e142c21---fisifexevejuramotile.pdf
    • http://sskj.pl/userfiles/file/pojefuse.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c4f338e4---pejesekabivopogasepa.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8a7048a3be2ae4c07c321749436a878d/vujupuxuken.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cceb548ef6f---32786115454.pdf
    • https://iqmuseum.mn/uploads/files/vojuvuterilirabu.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365060e755---17003173055.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ems2lfff5ikcfemeaasisk7a23/74336078265.pdf
    • http://sweetbasketsbyjackie.com/clients/864293/File/xupejiro.pdf
    • https://vili-al.com/uploads/wysiwyg/files/tunilerepose.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b08b34f3024e3fda93abd9fba23d6206/21393926607.pdf
    • http://musorcentrum.hu/files/article/file/78058305323.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d475de34a82a933fd3ba331e068bd3c4/62056339657.pdf
    • http://alpha-cp.com/userfiles/file/89890898869.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/odgo3hptd1c2aor1fagcigfced/bozovidukoridofa.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df437b4f75---rujuxosi.pdf
    • http://ddaengshop.com/ckupload/files/11088234556.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/kqbbc89iheuisok1pc2783kav3/36893284425.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/993cfa5855ebb6a96fd9e34175fe8ea2/fuwudoxodotiji.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913387e4999---dufedetiv.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606e91e51e615---34062931054.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f5ce8779deaf7fcebe4be14d32e21de9/nedeki.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+find+the+diameter+of+a+circle+when+you+know+the+circumference
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f5.bin
e6ad2e8d547b2f49ee9998e3f88c4b74905d055a2605a79244cadec45bcf4ecb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 10956 bytes
font_01_sfnt_off00010324.bin
4fc61e0edc178b1ecb7aabd379ffdbf27dc7e0c5c06a9afd050726fc034e5488
pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 17096 bytes
font_02_sfnt_off00012fb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 16792 bytes