Malicious PDF — malware analysis report

Static analysis result for SHA-256 555b8f7734e77a3f…

MALICIOUS

PDF

78.9 KB Created: 2021-07-19 10:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6b0f4e2e62c2cd1912163394770e022 SHA-1: f6d0fa6399ec47c26a9cf9135b38fad80a2ace30 SHA-256: 555b8f7734e77a3fe4b4f4bc3dc485bc52e148e48bb25dff985c17169a331b6b
176 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms and point to other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cuisinescartier.ca/upload/editor/file/60504934477.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2d77c60a---35578373544.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098eaee90e3d---tosadebazujasokuwulubaju.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0617d5c0b---wazoxisiragetijexixum.pdf
    • http://rheumatology.institute/upload/content/file/dikidilu.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a751747f128---44519922808.pdf
    • http://jrpst.pl/userfiles/file/14856920478.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86643884a---vupedawabasovoku.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/993b1e94e21f81b0bd98c76196c9f3e3/47650443349.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a82589f9---87925273203.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/sozuwegopozupokijotonomib.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a99cpd91j9rqlm35d8oltg0g41/94094401621.pdf
    • https://nnkcreations.com/userfiles/file/21459182578.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081910a05c2a---metija.pdf
    • https://yocarbroker.com/upload/ckfinder/files/zomotifelat.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8bc80c72---51870991533.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/81987085227.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ggdik5dg8vjuf7cp52ib0i0nv/mazeniresekojelanujewez.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmqrgjnk6ceo96u4b33o4de0c4/pikobunokogemi.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p2ujrr6qb9ui2q6tgargb6r37g/laridudozujikiwosifa.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/7k6g7uq038vv5ub8vlqrvlmmk7/vuxamanefesajugab.pdf
    • https://healthmatters.me/userfiles/file/gudekojoduzotaw.pdf
    • http://tortsurprise.ru/upload/redactor/files/domisuvesiwimudabumu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=relationship+contract+example
    • 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_off0000d168.bin
8049c0db6c66c4434b1025c85d0a3ab96f340065336332a3d2a818e1e86cd363		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 16940 bytes
font_01_sfnt_off0000fd9e.bin
0325a8386c93c077d1ebf4dda3c9bdd8050b32b809edbc1070832e6fba11bd1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10784 bytes
font_02_sfnt_off0001164a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 16792 bytes

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