Malicious PDF — malware analysis report

Static analysis result for SHA-256 424229b85576264e…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 08:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccb4bc5bd14a9de422795fa0e3b6d2c7 SHA-1: 31cd6a9c3cf821e520d9399d3e07b46f5ede42e0 SHA-256: 424229b85576264e27019cd977e59a961e08d2d2eeceb3a9dfff93e4454e78d8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/a8melhmac7tbu74svk66rs0s7v/7693730786.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/19923291367.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c0e7da10a0ea4218dbb8a239ad30f55f/legulutawewamukar.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b3ea67ae---rikorasenafubowefo.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/be2798ef5d15dc34e6dc86e5d93b616f/dagufalazupebetiwedisuva.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/57227603967.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/69314286487.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db386c7fed---7236698961.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b3237877---botozamewojoxi.pdf
    • http://al-bandak.com/userfiles/file/vojutofotopabakar.pdf
    • http://cnkls.com/userfiles/file/1624787386.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/557846ec612674a6ff581331c9bc6db2/setemudepuvuxiv.pdf
    • https://tmtteks.com/files/kibixo.pdf
    • http://abimobiliare.pl/pliki/File/24589962349.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/24b67e868e44574840169390762bfc51/25793950532.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081532529649---17935657118.pdf
    • http://sieuthibds.net/images/files/13840041920.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeec778201---68706824290.pdf
    • https://alexandrapanayotou.com/web/images/static/file/sopobiges.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lunapil.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4bee2834a6775dc1ad6737f8b89ff69a/90125448431.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4698938f---niviwemageba.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607327a09b3cc---29471653780.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b40ec9e6f532106d5d2f95da19cca08e/62562244243.pdf
    • http://ankamet.com/userfiles/file/roduwimaxabujidenof.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/bijama.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=car+stunt+game+download+for+pc+windows+7
    • 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_off0000efbe.bin
d4135cba6d827d4974bfc7996f33ee42f9333918e0f9ca3a071fee018ed678a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 17264 bytes
font_01_sfnt_off00011d14.bin
a74e4525d45ff8324e32b3fe69f8a46fb92c68bd35f492c3628ca936f6729144
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 11228 bytes
font_02_sfnt_off0001375b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 16792 bytes