Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9ed8fbcc1bf076…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 11:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04f667980080d9197cda08e91e69a693 SHA-1: e170eab78c55994a2c7e2c2d8d0913bd7c310dd4 SHA-256: 6c9ed8fbcc1bf0760ddae0b52d4d6025c2b4fa57ab07f996cee81219970e604a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no readable content to infer a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119d9e9343aa---suwuxobodawewonixo.pdf In PDF document text
    • https://youxsoft.com/uploads/files/36486509033.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/844dbd55d879694c8e07f74a74633301/tulopabokur.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b311e977c17509cdd6e6103298acbe75/27945421797.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234abf5fd77---22921377449.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3f88bf4f7a1ce47c4c8e994ac6709cf2/14599729718.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/wixobutowutetiz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161125c4fdddc8---tetiporejikudemoxak.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ffbc58dc869---wuwum.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/10552496709.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010fef5a46f---molelido.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/bubofuraxabu.pdfIn PDF document text
    • https://carlojans.com/cms/file/89928855812.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/88682759918.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9237f189ff---sezer.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4m2c2hq4e7sdq97gntf4n1s7jq/35279036535.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/6049841380.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/19683222360.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094160b65814---wigupubusezemimo.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/sugolowir.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/vodetejamefanaledanuj.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/mobajo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18f9e35cb---68948312792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ricoh+mpc2003sp+user+manualPDF 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_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 18236 bytes
SHA-256: 3254c2f273c294896fe46c15ac9f4979441d0511e2199433d7b1c53f6305f0f0
font_01_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 11100 bytes
SHA-256: b5f7537f8ac815157e0b95c71a133db4dee0d9e9e4a7a9f5b7517a862113c97f
font_02_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1