Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9f3a5ff20689d4…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 04:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e29d60c2160d847bb31769e02503a790 SHA-1: 39129fbfbf29990d1c1e57e14bbf29435a28e834 SHA-256: 8b9f3a5ff20689d4e1cd604b008b9b9370aaf9f2696cd9037e1099e588ed7357
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://essuances.com/ckfinder/userfiles/files/53397443348.pdf In PDF document text
    • http://newworldss.com/uploads/file/78560304079.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a931b473a9---45942787778.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/kosawejatixadedajorizud.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de9f7a6f87---kixumut.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613202cc811a3---69106899971.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/99111269846.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/98595413198.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/12701980680.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/makidutekesobuboxuwudiwig.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/luxoko.pdfIn PDF document text
    • http://viorina-deko.com/images/file/26808928358.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145363b162e9---35229249708.pdfIn PDF document text
    • http://byecook.com/ckupload/files/33363085222.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/12714411619.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/mubinedovexatiwazixa.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/60227476836.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/gusifewonebureveno.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/patulesoluluvufob.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/jexonitenilul.pdfIn PDF document text
    • http://sswjeans.com/files/lejowadi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613caab7e74df---87287502806.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/72b45cd6dde213a7955339bea6c06bbb/77442904518.pdfIn PDF document text
    • http://jonme.net/ckupload/files/1073931426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=assassin%27s+creed+bloodlines+download+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 16704 bytes
SHA-256: 0a2ff22954dbc5591ed4f3ca5036c067fda29caf7335d33bc1ddcfbffd0361b3
font_01_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 22080 bytes
SHA-256: 0d73ba87ca9535fc87ced23831de9ffb9561aef047a7ce7f19e7fa56d1d331b6
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 10612 bytes
SHA-256: bb57fdcf03e071906e151f72b8951fdca9c47b25d5443019d4c78afc46b795a7

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