Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c167a69eba07d95…

MALICIOUS

PDF

90.0 KB Created: 2021-06-25 15:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 341d96014fc55ab5bc4a1888be699925 SHA-1: 21b90fd3f8c76fe427eed263a248728db51ac771 SHA-256: 4c167a69eba07d9566baf02b1f4580993e3714e1a0f917aaa97416fb68760d6d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely as part of a phishing or redirection scheme. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608078547d9a2---wokexa.pdf
    • http://kapelski.pl/userfiles/file/wufubejamu.pdf
    • https://ludifrance.fr/userfiles/file/kujudofi.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b67329ea7---95101662860.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/607c1ccb311190936a831ece475ebf47/potoz.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609345b974580---belabomufivoxinot.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6bf4a9cc627c546ad11648620f41354b/tuwariwilexemowejo.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d227556ac6---difisosisesipukuri.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d4aa3a7e1---37210088115.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/matat.pdf
    • http://ncabhsa.com/clients/875427/File/tibinobewudebepupawi.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rm405q4hmm2gjmd3fcso0o8blc/sipegejizowula.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc368c6505e---madinagevodapu.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c1a990aa0---retowezovodirerulapunaxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reckless+love+of+god+mp3
    • 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_off0000e472.bin
5ca0f057fbf63f5682e7944538b20cd34cad7b03a9ae8dd6a9e175cb923574e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 16340 bytes
font_01_sfnt_off0000fadd.bin
440a92e283dbf1955975b2f56f50d22533f14c1faf08fc7cf198c025f4917531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 10784 bytes
font_02_sfnt_off00011399.bin
a52daf5a8ab1d37dc8a9e27d2c90f636d64471d88f8ae20861663e35ec2fc099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 18448 bytes
font_03_sfnt_off00014304.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14304 16792 bytes

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