Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85a1e0db8b6e171…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 20:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 709d375e204206014e65d2a9ffa9c45a SHA-1: 0cf8c28c28d21d0f5f632bfe2417c8fd6de5c7a5 SHA-256: b85a1e0db8b6e17141e1b217a6d9c5e36513c388dbca9414ed685801322a8553
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users into phishing scams or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=anker+earbuds+manual PDF link annotation
    • https://datawire.gr/files/files/tepoxaxedanebujasupajedug.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c6bd26e8---kufanofenewiruju.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091697836dba---safenegolegakonoxeseveli.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fbd4834f1---domilorevupesarujazitil.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7a08a9ff4ec20b38fb1105c0af9737e4/78035787196.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e165209a---mokekamifazagap.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/50597827303.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a92774c1d0d---sifevokusedevixerotal.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/45712422054.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lujlnghoe4udh8db8tq9qa6979/mojawosiluxaruvoj.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/bewinevataz.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb302b0eb---kivudovadusugi.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/tijonavudizojilekune.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a11871c41b4---sivuzufa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e11e8ce34---dijepajutet.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/bedamavojirepebaf.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/78390689116.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/53594983207.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9258fdc---63010451216.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/wabimijawufaga.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/95357481188.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_off0000b480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB480 10412 bytes
SHA-256: 01eda2be1aa537aa76f0f9fa4f357487b9f39334be1659ca42c3792694d74d14
font_01_sfnt_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 15888 bytes
SHA-256: c37b0e5a41a9d01c8cf9307b4d027fd79046252b7188be4568c55cbb13fa2988

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