Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a7351009cc8914…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 17:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aee60ca37e76bbab4b2fec3b8f5202d4 SHA-1: 264809fe72ca3db105b1fb6fee892f6ff8bf2e12 SHA-256: 98a7351009cc8914aee0922c6f178b7a4f9963b0f227d083ad6f649ca2bda350
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. This structure is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/dacc8abd5fa4a37e8a90a2ae6b45543b/71985424910.pdf In PDF document text
    • http://nuitsdartistes.eu/images/file/12685663601.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210816205916.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/litusasezogotovu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/37077754783.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/32187248859.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f101e775f7b---tukogiguropofiwowejofeti.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0c64c2e5966b38a37af29a464c360ed0/98178563855.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300811334649.pdfIn PDF document text
    • https://chp-travel.ir/data/file/57163320692.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6740cd28---bilegijiruja.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1bdd10ca25031ec43c6ed4f32a07cc9b/nuferakogosojuzoge.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf22386358---41115830241.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/wifaxo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f224c52ab---mobevebijunuzowodure.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a80247a0---jopinejewajalorinisetam.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/55951275833.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/lebum.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/mimoxi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160718764dacb6---mofufadopoje.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0idi37fvq1fh2g0p45co7af4bn/wekezalegimuboxirakefi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4298dfce0---5236335052.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/16261111497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=algebra+formulas+for+class+6+pdfPDF 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_off0000be5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 17296 bytes
SHA-256: 3c5ea56db5c3abe528c4d9e880fedc08e61014829c306719d60bf0fa3d31d987
font_02_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 11060 bytes
SHA-256: c7a3dbb05a7fe8673fac2573175ebc8366b986db8c2c1752daa7b3d9500311ad

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