Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6673585c7a7a37…

MALICIOUS

PDF

88.5 KB Created: 2021-07-28 08:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfa40e11e2d5f4e3f66314b40e4211b2 SHA-1: bc467c345437f3fc50152397f3fc7bdf242f65fe SHA-256: 2a6673585c7a7a37eba0a22f02d0e380be156f0c17f1c2d0d6f815304564be7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised websites and potentially malicious PDF files hosted on disposable domains. The presence of external URIs and link farms suggests an attempt to redirect users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/66d8e3cbd9d26948830f55e8883bbfea/ritanezikezozigiwud.pdf In PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e38b42b317f8f382216b2b8fde063470/34381325662.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/132945ee6305ef2cf3543a87f468806c/79487141203.pdfIn PDF document text
    • http://arablift.net/userfiles/file/4834135455.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7336b0836---badowikigeguw.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/fawalatimadizopew.pdfIn PDF document text
    • http://toonesk.com/upload/80965626972.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/82603648571.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/60253096110.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c131f419433---famujabokexevuxoneluji.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8875d87df---judowobajetuveli.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/838dcbcc5281584631728467c278d28e/40481587696.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/mizatifigubimokewubu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/fdh4vl4krobm259rgn67gs96uk/lukifinejidezirizobi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c37637347---zoxajuvolunodozifotifa.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xozax.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210726091246_172037900.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083490eb8267---7797008351.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079db3371812---xugulob.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6albas5f88jhvg786m4k4cien2/detuduradojafarasor.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160affac981d06---vokugomopapafakibavafe.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/90481d0f42bfb523001ff5b859a60281/xigaduvid.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a707f93b9ab---pifuzowerijizunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+%C3%A1rea+y+per%C3%ADmetro+para+primaria+resueltosPDF 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_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 11140 bytes
SHA-256: da5a5c85a0efb194a77f1161d5e857da2cf9b8ca527088b37c5749d24409818b
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 19804 bytes
SHA-256: 3fc1ee39f07da996e90b6f0b4dc18ab6232ddf7d074154d644221e7516665334
font_02_sfnt_off000138dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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