Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a471991eb08bcd…

MALICIOUS

PDF

103.4 KB Created: 2021-08-04 22:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05ecf0b14ca89db583d9afd7965ae566 SHA-1: 6e5626e1bc286c426f709c71e403dced8b9e376f SHA-256: 30a471991eb08bcd033c217c2380140179c95cba0b12abf271e08a0236c917ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a tactic of leveraging compromised sites for hosting malicious files.

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb29ce7cf1---56503953721.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2b3eb6107---pijugonufufarasi.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/52476988434.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7n0uqpcq8rhkgm0m37e46864t6/xepirugulutila.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4c61214f42fbbd7e5d0ac43b571798bf/xezoxuxobewerof.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/viruzesafilupup.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/skcdevq9ig2qrlc1dongcsq7n5/55463480622.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/94836e52e93e6e8151dec54a89a7ad7e/72028386079.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160989f321ccd6---65426974132.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d8a99a1e---bifipefotedi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/nrkaok8pph94s9lp8h44qe0ii7/judojepakuvufejum.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031c44be064---gabitit.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec13023ad542fa70bdd8c72796656e86/tedanemesugavegibu.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/dodedajiroxemaxusufupudod.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/gonus.pdfIn PDF document text
    • http://turbooto.vn/upload/files/36296553095.pdfIn PDF document text
    • http://matras-devison.com/upload/file/12136051717.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/37873906356.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/vamutimuwakefosapigozas.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/81765587865.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc75cc1a4---tifilozebaba.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/16369225724.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160db760cbd65e---jasotufiwizezomav.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/82096289925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+change+chat+font+roblox+studioPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 11172 bytes
SHA-256: 8d65e544f654c9e63f66a2792452cbef631f12583260b782473c02569b526d9b
font_01_sfnt_off00014782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14782 17720 bytes
SHA-256: b85774f9cbdae7cadb51bc3ff2e52be7e17bf9c9514c60811eec03f77ed11bfd
font_02_sfnt_off0001767f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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