Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16259659e04d57c…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 02:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0530f2f6f469074969c05e07fdd62a3 SHA-1: b874bdbaee43b1f6486f7c7229a6a695ba08ee9c SHA-256: d16259659e04d57c38f811f7a6f6492c72797e123703a567a52f6732867525b4
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 multiple heuristics and a machine learning classifier, with ClamAV also detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be SEO manipulation or directing users to malicious content hosted on these compromised or disposable domains.

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://cructi.ru/uplcv?utm_term=bayview+golf+and+country+club
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92cd92118---16574236203.pdf
    • https://actaviaserica.org/board/file/files/mujadekekuxivebibuli.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f6b5b1bffe32950a03c74fdb220f447b/37445117794.pdf
    • http://ahcxdq.com/uploads/file/292310545662.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fc26480d---rofuwuforenutarivemeja.pdf
    • http://crosswaysrecruitment.com/userfiles/file/37527906468.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf99d15678---4155760501.pdf
    • http://luingpyrex.cz/foto/Image/file/wofonoganifaw.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fm8vvifp7fjh7t4pvm8vt9oahd/95204888971.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174bc7b3bb---sutenerasagudexurakaj.pdf
    • http://creptiles.dk/userfiles/file/41638583070.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a689479e85d73eade8ecdd7b77c1d17d/nepesuwirafiwi.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/em04gm7d96ishctehcsbp4cigj/tegez.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/co270b2qkd97c13eqpouitc1d1/labuvojivu.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb92b019e68---63265216023.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d705ed5e---40745427793.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ae125542---biwunesilanusa.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb3001eac---26859857578.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0b9443214b49a9098c1b1d8b361722f9/zelerawunemamogufabivasu.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7bbb0c55de6f982b114c23112be4ec1f/losagoradiwavonusitutuvuk.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75735503b---bonarikabigevatidijulita.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/969be1d1e6154eef4b2200b3d0ec7214/82901499673.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607894439b5b2---61048328596.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160969e19ed30a---wimevibe.pdf
    • 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_off000100e0.bin
5f4c66302dac0d28f70a479f4f41d7892d678490b14329b7460a9c7d09b8b0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 11044 bytes
font_01_sfnt_off00011a94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
font_02_sfnt_off000132a6.bin
d57c91d3f822469dcdefccd4b1ce6af13f6b51eb666d84cbf081ed960add68ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 16548 bytes

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