Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc19b8b7057936d…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 00:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a982543407c9f3df314febc81071741 SHA-1: af9d0df97371b9010ce1184a76eccb83312d121d SHA-256: 6bc19b8b7057936d08ee3fc384932663af0dfe3802e5ad4dd1623355713123d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://microcement.ua/userfiles/file/xobeluwadulew.pdf In PDF document text
    • https://mrdak.cc/uploadfile/files/69726756235.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/52854898436.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3c57c772---56194555516.pdfIn PDF document text
    • http://huntland.hu/upload/file/wenonezez.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/97485122742.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e74bb7422---mavikanor.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/qektef07v77ruimip5tqus6ijr/12363778401.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/95910132320.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/92c850928b7fcd2f383de65164c90c42/49528296701.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a258ba30a---96918346543.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/96776435384.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jetenafinozinujimexiteke.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/85385d51ecd978fd1efd3560278e72bb/68265984052.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/34426654362.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ac419ac56fdb6cfa59b1ae84a8e838ee/jejejuragixekupulupi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/t7vbfkfv4d3um0komqksc2kck2/xeganujoguxa.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/75790281317.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d879kkee394dvii78gnqtelol5/86279528167.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1a7b258bfeab24a47e44f8bcb51089e7/4710721640.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/11265f8e9c776d5978c1ccc4c83fe2d0/57505469196.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd9b1ba62---6074387414.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d10f229c8507773c95ef11043aa8866a/99466145701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+are+the+7+elements+of+art+and+designPDF 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_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 10844 bytes
SHA-256: 44ffedd51e12065284702244710f44cc780bd6fdace0171dda026f1d04c7dd71
font_01_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 16632 bytes
SHA-256: 78f9ec28317f9e1b98bd84ced40fe3e4c477f1e2b7d46ee13dc83c6201f50118
font_02_sfnt_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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