Malicious PDF — malware analysis report

Static analysis result for SHA-256 338a5ebd8de20238…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 18:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f4c56693404d015cbdacbdd47d0a44e SHA-1: e34ce936a30dc1570b7b3d7ea4205df3445232cb SHA-256: 338a5ebd8de2023832220efad18ed7de5cabfd217e8d95b4af2a14dd6e607fa9
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 websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate effort to obscure the malicious destination. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=google+document+translate+pdf
    • http://riskhedgetech.com/uploaded/file/20037538260a3031e6b6c0.pdf
    • http://liddellgaryfamily.com/clients/863293/File/jokuredagudeni.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/37495201101.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210809_A4961D0A7FBC6622.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccabf2d33b---jobusakotu.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885df37f279---77011369943.pdf
    • http://prinsart.ro/uploads/files/1022612104.pdf
    • https://sealskinz.ru/files/file/natuxi.pdf
    • https://sonarmusic.hu/up_image/file/20808848978.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uqjtrhjkl9hv54q288bpagj0ni/589422464.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d88755893---94865134767.pdf
    • http://volvo-cars.jp/js/upload/files/dubusidalapadudagafadex.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2ac75e1a---metexikewabupegig.pdf
    • http://ibb-online.ru/f/file/96221980870.pdf
    • https://qkon.ca/images/file/fivodasujagidilip.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a234c1bbf72---donozuduw.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c864327f0da---55923509472.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/703bf6a5ab4659a4f60eeb22f77fa987/nunefawuwivaremovedaz.pdf
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/23659615477.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/b1eva6d4kitlf1lu658blnrdnl/wuxifusiwebabefipi.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47fa58475---mesexomadotuwifemug.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608014ea87123---wokudoduzutonizore.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/kefavidara.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_off0000e09b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 16792 bytes
font_01_sfnt_off0000f8b2.bin
6faada9e6033ac5559f3538f81d63e7db6e68c072490715429637a71a1ff5883
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 11012 bytes
font_02_sfnt_off00011221.bin
bedb2f8d023659337546b26331eebf2a253028d61854dfe8abe90741651b2b80
pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 18276 bytes