Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a66f5bc4cf88c1e…

MALICIOUS

PDF

78.7 KB Created: 2021-07-18 12:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7a363905100556e8edd3f5353c33c1d SHA-1: 41d566e339cac0f5debcd9f16ed0f8dbefdd6a75 SHA-256: 8a66f5bc4cf88c1e49189838636f8efef354fb8ff0c4e0b3a1e8e415e70b3a77
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2df70e28---70944616007.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ld4rkknbjnkps8jes5ko15rl8m/54714154842.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083284ded151---gekabu.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/20882074826.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/43a314911aef3b6fb4a5713ed32e30a1/fokagejin.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f61009440---bunagej.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/fiwutuxarajitas.pdfIn PDF document text
    • http://biosite.ru/images/news/file/24731431160.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/sitot.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/82476853209.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/300a455920dae6052fec271656eb6352/deletokenexuva.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/75238574089.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/be3ousrrhngsv92bja7rie100s/56286171690.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607608ef78cd6---gimowejerimodedukile.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/94677926735.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/2806834930.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/dikum.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210621194621115.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zimuganamutodogixiri.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f329106c---16224124837.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/gipota.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41648a523---43792741676.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44b775951---gosuxidulenelasad.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/44378448442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=about+financial+accounting+volume+2+7th+edition+pdf+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 11444 bytes
SHA-256: 87eb658d18b2ad160c5b2e6837288e1cba30ec3390c985729cc327eeac8d8af0
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 16460 bytes
SHA-256: 56ed7ad76bdf922008458903c204dfccf14949882946a39a605510d3e3763c1a

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