Malicious PDF — malware analysis report

Static analysis result for SHA-256 94462a7ff9e8ebca…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 01:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 925b64e20b17be37d19e51322fd0f5ce SHA-1: 942aa97627d49423f69049945a5e3f9f700c8731 SHA-256: 94462a7ff9e8ebca08b16e80ff398f767ffbea81356970c4489b9692f637e39f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to host a collection of links for malicious redirection. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=bluetooth+tethering+app PDF link annotation
    • http://snbedu.com/uploadfile/file///2021090617581896.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae1bb0fa6---9696582385.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/fewurefojodirilomofumipad.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133f977a07a4---lafam.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/xijuxodajitekulerekoge.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/89538134346.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/wunizevubufifigokotogetap.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/43196375459.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fdd7562aac2ee0305bfd64e2ff7b7008/80537255744.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901125613223308.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/demiwizofiwaxagumef.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e38f422a0---2453367118.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/gomuwogenakunojom.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/xalalexorawugokapuwabixux.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/zegerek.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sigonajolu.pdfIn PDF document text
    • http://chromoink.com/updates/file/70069630210.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8e3nulcmjnoddphmso0drthi2/nawuderewasirimexawu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219121351113132.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/soxunoloditowomat.pdfIn PDF document text
    • https://zagi.hr/files/77259726076.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/tedilukajibemakibaved.pdfIn PDF document text
    • https://linardi.ru/files/file/zifosuw.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/70481630692.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_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 16708 bytes
SHA-256: 5d80835a0324d54774e817d5f4530cf72326c75164fd0645c497fe2ba15dae3d
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 10516 bytes
SHA-256: 02562735ad6a5bc4321f42633760e3cac4bf3069f7a699edbc018886ca76c19c

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