Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efe1d1f339bf84a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 09:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b70d82a6e56229d38d0c2aa4a2b8d811 SHA-1: f3fe0e0f34187007ca7c8da90803f527886e9b6b SHA-256: 0efe1d1f339bf84ab1460c4d5b8d6bab14b711980185681096fcdd7a4b32d54b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=ali+sina+understanding+muhammad+pdf PDF link annotation
    • http://uniquecharacters.com/upload/files/53244296023.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/71612514661.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098b102c75cb---pedabefubis.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6fc371e8075ed98f3c2b4b72c3159403/7310984901.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ede940db747---13609640091.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8r170sfhoci578i8l5anavrlv4/23480579197.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160821fd087c49---verid.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/92176275653.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109011908464817.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c24d826b88fe6b1b3fb2d93ede2d686/rajezetav.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67517bfb8edfc097087c22d32e7e7a00/serowubaxidudunoxana.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16128962e82f5e---josefewafixukeguliwu.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/30420579245.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/rijaziwuparinuxiwu.pdfIn PDF document text
    • http://yilip.net/userData/board/file/mixepupekazus.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ff47dea7---kubolifinidofepofidonowib.pdfIn PDF document text
    • http://synowka.pl/galeria/file/devoweniziko.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kisoveganemefotigajaroxe.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ksud3apmamkq4fhdoootnct3a1/69818289836.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/6051204125.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b982a81189---goxopazep.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/72253028931.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/16723639050.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/wadumomojupewimuwugizemox.pdfIn PDF document text
    • 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_off0000b656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 10908 bytes
SHA-256: 94e168a073b7d8db8d9c9a68b79db208ba6a913dbfc14e5c7bfe38981bf65439
font_01_sfnt_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 17712 bytes
SHA-256: ae4ea43cc62d1b4910b735a6b1a00c6521a9706df223888cb7db3d8431ba0ac4

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