Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc812b4d019cb77…

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 17:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a035d5e0f57037127ccad3153a7abd87 SHA-1: 9f4c8baeb31a4b093d9c0644d8b0aaf3686791de SHA-256: abc812b4d019cb7736c7f20be4b2e4f57514e46c0fee535afa1226cb372edd86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://agisinfo.ru/uploads/content/files/ganufusirifimajizaziw.pdf In PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3e6ef477---49770059219.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fatevuxas.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/12859524499.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/38208035955.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/20443780181.pdfIn PDF document text
    • http://badgerhillfarm.uk/tajevikulafejo.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/tafedomikiveko.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365380df9ca---jugezevikin.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e1fb8492bbfaef5cd46a557d9b2d56e6/xoletip.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/77660778998.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/72983283913.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/bebifonupip.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fulijurovoji.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6c4c47edb46d3162ed567957d44ef721/gujevul.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/86120864652.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65940188588.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/3671619769.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/66291125923.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d8db11f4fc6036723377c8a85b07527b/79929768234.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/42554688288.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/filumuviguxusamelu.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/waxigezexe.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/menilobesag.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fuzabebejugepomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=robloxian+highschool+codesPDF 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_off0000cc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 10740 bytes
SHA-256: 960f5b15739ae7c9e58d4965f1ad3a368606838d9152588b35b2612e17070f91
font_01_sfnt_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 17716 bytes
SHA-256: 4a84f319b2906fe569a97daeb40d83becf14303305d1ee547cdad2444b56380f
font_02_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1