Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2e7ca7e1100376…

MALICIOUS

PDF

78.3 KB Created: 2021-07-16 10:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70e0b186b72abc8d5ab0a45e19676886 SHA-1: bca18ea480b32a392fef3a8fc4ce5fb958a6862e SHA-256: ad2e7ca7e1100376e57c09c95fd89f3f1cfc83de718720b82f6628d4c24e1d44
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it is used as a link farm to redirect users to potentially malicious content. The file's structure and the presence of external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=section+3.1+the+rock+cycle+answers PDF link annotation
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7be283cb08d12a0d97f81252c8eb69ed/nonoki.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078479c16620---vebuxodibizoseke.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3c49f8b0f2a3301544b46f13a36fcfa9/monin.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/buniteluberoselavuke.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/71387166847.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a05636d2ae2---25269390528.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/bavolexoxukiziwajoginaka.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/88789694084.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/61642764008.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/jirawiwofa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2a6fb07a82a4a0582f7a65cf86583f4a/guzaxofedatog.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/bixozawelakodof.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/45ea0be7053294fb076f386d52e6ec8b/fisufowatamotudi.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/07dc1d6435c4c679dad59383491ddd7d/93934644142.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9dc6ab96a549faab0139a43677ba8f90/rekenekerepodibobizomani.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/okm35589uk6k6bkunu46gt4lqi/dirabefafenozevonon.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608849b855d82---navabonaxezafefeto.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/funilezu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/laoloesl9cpe107vobtnbgp45l/zudulululerowuxos.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/kepajirulopofalaxazudu.pdfIn PDF document text
    • https://tonitomov.com/picture/file/98827331082.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc6ab65fc---xipenozamijakevomaxasa.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b0123123---livelupog.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc267ba38---vukasajedinibibojage.pdfIn PDF document text
    • http://alltechsro.cz/files/lilixiwesukuluzepuvut.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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 10984 bytes
SHA-256: fd154326a8400d235ca827c8a4380b9bb673c1acc03d8a51f4a74b51d00688a0
font_01_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 16972 bytes
SHA-256: 45c4b442b9b1aa71e6938cbdbe0e7ea1f133dacd06a05279c9b6fec8db18d9e8
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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