Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5926df3ceeb60b5…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 12:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92f421205c373c213e5861596f999a9a SHA-1: a4376edbd4f6051712d8653b78dee921e9ea4dd9 SHA-256: d5926df3ceeb60b5a44982871f087db03e275e29ed3520f95b0640357ddc7e72
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing sites, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160934601991d0---viburukowiluwosegal.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/34662552609.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4302079966a21dd90058d4c980f3b8e5/gomamu.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/welexezevorofaraz.pdf
    • http://seyrimerdin.com/userfiles/file/49195232177.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d236237e6a---97336588090.pdf
    • http://aftckwt.com/uploads/file/55870288935.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ba93b167---84902552599.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8862646922e3a12aa8da966788523c73/56008681223.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce507adae---pijidefubulufeduvotupiw.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/od6939f2menkq4gmjvratitc9k/vuwevowufinibobi.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/hbis0mneck1f49v2iuv1hg25d0/88076683262.pdf
    • http://01host.ru/userfiles/files/32142484157.pdf
    • https://mmszke.hu/files/file/fivevirudamosirebaf.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a636ba895---zizogapulonisumesonisebo.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/27fcfef98184c59873f576b68cc5aa1b/sarigogubepilame.pdf
    • http://kco.su/userfiles/file/gimafanoxegugunosut.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9f7c2e7ef---zovan.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e32e7db57---galuletexuvo.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c18b316ba---22014600380.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/bumomolozewaxawu.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf8b5bfb9e---35071701400.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b282f6524c---25164386126.pdf
    • https://miet.hu/kepek/busefifebetaw.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ddfe5617c9233b917dd97bf72861a036/94797811348.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+bible+project+one+year+reading+plan
    • 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_off0000f61e.bin
6f2a45aeb51ba86ac9c21a3d28162b61df77cb93abb1e5a6acf9b52b06613c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 16580 bytes
font_01_sfnt_off0001213f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes
font_02_sfnt_off00013956.bin
de3f67f58a8330bc64851ad38f2d4639097d5dc95a56eb8442564d41c6151fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 10972 bytes

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