Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b7cdcece7edd1d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 10:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 27cd29fa1fd9dd2f9d3b0b1ae71f9175 SHA-1: 1fc3c2d5a4941e78b16020116d8acbe8aa43467e SHA-256: c3b7cdcece7edd1dc4e5030ce2ba3764fc9eb591f4e8cefc63d94da4f3216282
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, likely serving as a lure for users to download malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document provides instructions for accessing a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1da98871f---66751311250.pdf In PDF document text
    • http://askaudit.ru/price/38864642878.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/xefosexuxabavoj.pdfIn PDF document text
    • http://castel.lu/userfiles/files/sepele.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/37852664097.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/towanasufuzobula.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/xabimovokozigo.pdfIn PDF document text
    • http://robbes.nl/media/files/konuzuponaxiwironemudak.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/26248782904.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/sebumatonififesapuvedujoj.pdfIn PDF document text
    • https://anjingliar.com/contents/files/sizin.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136155ec4e5e---1985044487.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/97862408359.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/nexinosalemipiwofijejaga.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/90604976884.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/nakamuzisukitana.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f7972268---39247186436.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/davuv.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/34099455148.pdfIn PDF document text
    • http://kalikraft.com/images/file/kupafugelodusokiwe.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vivogagagigolezokumeke.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/43707883118.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/85476844134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=keepassdroid+google+drivePDF 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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 17616 bytes
SHA-256: 11f7d43e45319a8d375426d703d8253358940161e0ee8e198027efb7e0be97f9
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 10424 bytes
SHA-256: 0b7d1f557417238d9ee07bc6714dc1b51f2c3a5088e8cbd8a4d1c96089bff6f8

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