Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fc2909ce3ad9b9…

MALICIOUS

PDF

92.3 KB Created: 2021-10-08 04:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fef472cd062ca35b8a47ed4586a119e6 SHA-1: 9eab1cc62947f488ae74c262b80f5197d7257c6f SHA-256: 21fc2909ce3ad9b9f41212fc1d7543b5b88a44b75910cff0783b9fc1b973384a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The presence of 'invoice' and 'password-protected archive' lures suggests a phishing or credential harvesting attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://thietbikhachsanvinhhung1.com/upload/files/zefesodivenuf.pdf In PDF document text
    • http://burbank.kopanramen.com/uploads/files/zavadiwipotiri.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/1739663900.pdfIn PDF document text
    • https://ienter.bg/files/21274185713.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jooul8fcfcteu28vss5r1pe5j7/79795819901.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145990315aa8---momiluxasewafisovebaw.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raregogisubat.pdfIn PDF document text
    • http://portableandcool.com/files/files/89141676353.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210924105126.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20211008_3B0547AE4C4C62FB.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/33806587809.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/45926593307.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/rakuwosutiruxudijapaf.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/fejejelepijivigorudi.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/93804944035.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d020780664---87121085225.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/61235758214.pdfIn PDF document text
    • https://ayurmitra.com/files/file/legifufewaloxalomilomari.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/giluzaxozajiniwogatu.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/sigigop.pdfIn PDF document text
    • https://hssanesteban.cl/files/mosuwubi.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/69425702056.pdfIn PDF document text
    • http://jawarakreasi.com/file/nodokovakugegupuvoxuwo.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/68351740335.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/2010199294.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/88302219566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=revenue+stamp+for+rent+receiptPDF 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_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 10804 bytes
SHA-256: 1c97f5716702d9b7476546cea2eed9220d91e4298ec591b8c2ccd9f95c228190
font_01_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 18428 bytes
SHA-256: dffbd678a083e22699d00d0460509d0b579fb99497187f9f7655f4be5311e8d0

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