Malicious PDF — malware analysis report

Static analysis result for SHA-256 8459f7c1bd8ddb24…

MALICIOUS

PDF

82.1 KB Created: 2021-06-26 20:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66bc9b6fad0f41afd9a8a4ddd71e5a83 SHA-1: 59c952f7f50834dd27995aeb5c46c2be6d7cb226 SHA-256: 8459f7c1bd8ddb24461ed857ce2a4adcf135d9d63a2571a8961c139ec50041e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tectrongim.com/uploads/files/dufuvubelisew.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/wifimuruxemoj.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cef3213d9---wavunuxogesaxe.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pj9bgj6gqs7v5sol9c6i65d33v/xilurinopixazoxi.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fc8eda811ab4660b05152bbd38d61d5d/fexotisagolizes.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe46eba3b---xunaneseriwuwuxavuxagej.pdf
    • http://officinedesign.it/userfiles/files/78459318518.pdf
    • http://daycamhoa.net/upload/UploadFiles/files/88488483973.pdf
    • https://yellowstonewildlife.com/51022839168.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5b339c5373184885e8aa87677e067bae/11580082977.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kot9g08a3er42ui8klo5b90htg/4296865171.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ff47e210---loxasefugenaz.pdf
    • http://sity-luxe.ru/userfiles/file/90058520383.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a15493d7---59472447027.pdf
    • https://bloomland.com/sites/bloomland.com/files/femesumupusufifotozuguvek.pdf
    • https://tecnicadovolante.com/images/file/82366051725.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cdec2e00f84---44559627994.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0e30a1b25f46aaec18cd5cb65dbcf9a1/23986119392.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f262f6346b16e59b5da2a6e5bef83a19/46934600374.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6467c316dc2e7ea233e6b1583fb56862/16186429836.pdf
    • https://iwnta.com/userfiles/file/52652377065.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1fdaf15f8183dd13fbfd42bc7ff8964e/61012490483.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add5503823---sexagiburivixepukob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=household+chores+reading+comprehension+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbda.bin
e7efb7e116bd6978030523d339da5846673a7c93feaf64e7bd5eaebe6d49e64c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 17564 bytes
font_01_sfnt_off0001099f.bin
7267d6d0b428bd0359ae6756d0015ad7608e8ca58f289655e5862565ed5cbd23
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 11060 bytes
font_02_sfnt_off000122e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes