Malicious PDF — malware analysis report

Static analysis result for SHA-256 5350c2ce5ced7342…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 02:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5045487a57bbde28c005bf24b436ecb SHA-1: df761c6c43404970dc2645d56c9704f2e4eba2b0 SHA-256: 5350c2ce5ced7342c05ab9a93e755de0862206931d4d109bdc33a2cf7f58a866
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://allytemp.ru/uplcv?utm_term=international+soybean+prices
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/jijaliva.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4e9d2cbc---19603434926.pdf
    • http://aep-tc.com/cache/fck_files/file/16537867884.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45c76206d---labome.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dce13npo3l0dpcclpb3uomdgtq/96960426050.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/15231729532.pdf
    • http://noithattamphuong.com/upload/files/27338319308.pdf
    • http://thesetnews.com/images/fckeditor/file/21653488201.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b80bcfb7be808d8fe23abad2e475f7c7/jozowawukupuxefizixuti.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d92f5ef---25003692080.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d0997927b---40592343527.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2i8qkhhqhm3k0bdf2ci4p7mr0s/19411998036.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7de25270434eb741bbcc6d78d8b7ea03/55660678898.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lfdjiemm6lbm758a457ujjdot6/katewegomepamepodux.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749fdec502b---sekunulub.pdf
    • http://alpha-th.com/userfiles/file/19002482482.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd322b92e4---10168337692.pdf
    • https://clove7.com/userfiles/file/75608853501.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade216d5276---84091676297.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a01c87eb3---66720067931.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0b349758f526d20b4b93e6ea7d832129/gorevemolefijusuvoleva.pdf
    • https://twr1115.net/files/fckeditor/file/8253558892.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c943ca6b8ac8c9bccccd3442076c04ee/fudalonunijununabi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e875.bin
6db22589f03dfd5fba6ef0e2d71b8027fa9bdd9afa394b8f2202f53f683c886f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16548 bytes
font_01_sfnt_off0000ffcf.bin
ce6ad801043f7054b9cfcffabdd6d41ffa70eebb0afba93a1993e48e9e25390b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10572 bytes
font_02_sfnt_off000117e1.bin
de2514fb8e91ddb4d4b21bc77711e7e8d48dd3a86e28b236cc961e52f8aaac91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16776 bytes
font_03_sfnt_off000143ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143AD 16792 bytes

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