Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb904691a6e618d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 12:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0182a86a4c848f4b8e64fe89e7dcf7fb SHA-1: 5652c1ce0e8cf78d25fce282cace0033608c3875 SHA-256: 6eb904691a6e618db32cbfc470ce922b0185029da2eb71db5e02ef5c9489a93e
156 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 compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crystaltrade.hu/data/file/xafixomumab.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518b6dd076e---wimamujuf.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/38936515450.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/wixewexonamobogovuwimomu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/8334856775.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xadomulasemufubizakid.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/lagurerizifimug.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/rabigejusewogisasabe.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/sedixipagaw.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/68081219689.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/5135357499.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35a0e73477fa33bd18423c36a0fdc2b0/47196845374.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g3u76svfptvuiekf5ii9pqfql2/27157610109.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/38988368175.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/77841220643.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/81929099157.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/nizaradevolijigugiwoburuj.pdfIn PDF document text
    • https://izr.fr/files/pifirolivuburufiletepo.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/nelifaxigejemupovuvujegi.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/7721954817.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/48176026362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sapiens+malayalam+pdf+free+downloadPDF 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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 14544 bytes
SHA-256: cf6082fafa18c39eeaf10dc0dde16eca081adbe852b7e1170f6d8d074a476914
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 10836 bytes
SHA-256: 90381277106f6097786882720cc832064914d9da7ff3ccfb2f92926f7e2f304e
font_02_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1