Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8428dc3d9c401c4…

MALICIOUS

PDF

87.7 KB Created: 2021-08-13 17:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6f042a93496cb8b6b27435835627e3e SHA-1: 530da5b79ab3024cd3567ab223ee2f4cf46f9fdc SHA-256: d8428dc3d9c401c46b3be82246371841d091a687d77e25c274d9afd829d8650b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chcial.ru/uplcv?utm_term=exothermic+and+endothermic+reactions+experiment+grade+11 PDF link annotation
    • http://doo-san.com/userfiles/file/20210513211340.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/matosiwojelit.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/07aa3b7a44d667e8d41b9a9d8000f505/27542624068.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/19302153776.pdfIn PDF document text
    • http://builderall.info/userfiles/file/salusimotawagugosibus.pdfIn PDF document text
    • http://matras-devison.com/upload/file/89759948756.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d737bd7b2---pexamemitalaxororosefuxa.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ae89b154db2e1e9febea63cf38e80ad5/xaviwabikuxusozodo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7441c41583---45759827188.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/48747724010.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8418d38ae---jutexefepifu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fc06fe8677b18ce4e29a7e7662270837/12277500061.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2607a67bd---85620333264.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/sovebezenemep.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/66613780176.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/33943750568.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/zivojizetususonote.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/35429992261.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/86382989279f88a528fbc1ed82259ee6/zigagadariso.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lununedixub.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/69548733349.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/krk9n70gev89gtikb9so8hcq7b/98316480222.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/sirikinosaxadasorumudaja.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607640f5ace35---97891475941.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/rd35292k00s1giem7kknpodnef/17971013284.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8ub8qeoq0b7b1glh8nnea4mprj/dekeremosozo.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 11052 bytes
SHA-256: f426c533aa846373f36a3c8991c79d14497ee6ae587cf83e4773fb4b4148ea36
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 17764 bytes
SHA-256: 3fb31207d479a05a61be5ab5b5961a6f0fcca192c3af48cc19e1ffe4c964db09
font_02_sfnt_off00013619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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