Malicious PDF — malware analysis report

Static analysis result for SHA-256 4587f2b9e5440f49…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 20:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0afb4f0f948868da2ca4018833235c1e SHA-1: 628ac67e29a6c6e429b31333ae63d6e438d07b64 SHA-256: 4587f2b9e5440f49825626882147d99677b042bd6fbeca0698fbe610f2759752
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to leverage search engine optimization for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52838b5fed---41373378572.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc92d8515---7802811785.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f953a09e---95509611241.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/13017111463.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d83e4f504dd88350fbb8443fed6daaf4/54368648529.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4153698e4---mulesiwinokizobumos.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210529_173024.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/64530414683.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/23435880335.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jcdr43rqbk7n73cq7kg6132kq4/sujodiludososifisa.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jabinojerizofisudo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16085e1123504f---67074393460.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/443cb9a8b6ce8bbc8b859eedab121a0b/75300191628.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/nelujozajovamawerani.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/71cc7d01d1c13ee33a580e6f0419a160/gumatet.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sezakigekar.pdfIn PDF document text
    • https://blokhol.com/upload/files/rowojilata.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/66289499758.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edc386e89---bisunininusepabop.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/xizexelomuvazabekuk.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160af4e1fd78af---68895994939.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6c7ad7bdafca077bf579310e09110e78/zamifipinaxixiluna.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/9f2c7c9a04b5824b2f74064fb864af32/tukosomatapexakive.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/83gr6vrm7cthqmbbf887pllilg/18233448155.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2fb1062cb57bb312420ae46ccebac4dc/78267241836.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/69718136360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+upright+pyramid+of+numbers+is+absent+inPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 16392 bytes
SHA-256: dcce87bdb1b910d3c01569be823ccb92e2f212b80bfbff91818fd72cfc626a35
font_03_sfnt_off00012921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12921 11216 bytes
SHA-256: 45f764975db4ee138a37f0386f5fd4fb8773b1446a164b00f2f705d03c2d3585

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