Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bb4b43ae8d59f5…

MALICIOUS

PDF

78.6 KB Created: 2021-10-07 19:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e6e0c456a9d70eb9c4f3d410f1ca53c SHA-1: 1ddc3b1fe1241222ffd9ea11fd0aad12402e4920 SHA-256: d4bb4b43ae8d59f5c61caa8edf6dd4c9d695618c102d3289903fe6c2676da628
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to download and execute additional malicious content. The document's structure and heuristics indicate it is part of an advance-fee scam, likely attempting to trick the user into believing they have won a prize or are due a large sum of money, requiring them to pay a fee or provide information for delivery. The presence of numerous external links, many hosted on compromised WordPress sites, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://archism.ru/uplcv?utm_term=executor+roles+and+responsibilities
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d405433f66---kivitokipadufu.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614eabd0269ca---wisekovisinamepobi.pdf
    • https://kodcomputers.ro/2664/uploads/52201447167.pdf
    • https://amursvoidom.ru/media/files/lasezifijexekedowezil.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/tonabegudasenumuvid.pdf
    • http://club-integra.ru/userfiles/file/70918586338.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e438361c60---nixux.pdf
    • http://trans-serwis.com/userfiles/file/83638825942.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363178370ba---45921283337.pdf
    • https://xuantruongtech.com/images/ckeditor/files/zopinopute.pdf
    • http://info56.ru/userfiles/file/xunoxefem.pdf
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/baxazujugonofedovol.pdf
    • http://lafenicealcamo.it/userfiles/files/30098460776.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/17307021389.pdf
    • http://dpholding.ru/uploads/files/fiviwuwizixilewileko.pdf
    • https://paulogomeslda.com/userfiles/file/bopivagelesakibizo.pdf
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/82712096162.pdf
    • https://probidjp.com/ckfinder/userfiles/files/20211003_165755.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408c70bf016---debegowewore.pdf
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/66143648509.pdf
    • http://cuacuonbinhduong.com/upload/files/32441208267.pdf
    • http://fred-robin.com/ckfinder/userfiles/files/kosus.pdf
    • http://image.dlib.vn/libedu/news/bvu/20210917/file/70316965424.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_off0000d06a.bin
fd6538d278f2ca31591c6c6966810d108ed421e1847e04ba41d10252a675b30d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 17336 bytes
font_01_sfnt_off0000fc18.bin
f047e044705e9ad02134eef62535932e1d1bbef949c8b19b4ad3cc2618d31ce7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10832 bytes
font_02_sfnt_off000114fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16792 bytes