Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a0e3d0ae66d4d6…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 14:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b287a8fe888433c2eb35d65895f36fab SHA-1: ca46a53aa7511c2c48c4ca38c18ae9a68a608afe SHA-256: f4a0e3d0ae66d4d6240a04105517453d70618f0c638cb2205e789eb140643748
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links pointing to potentially compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be a screenshot, further supporting the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3flqqhf67ihqi8k3roir585ol3/61195822806.pdf In PDF document text
    • https://thailonghoang.vn/upload/files/17230677379.pdfIn PDF document text
    • https://domilot.com/uploader/files/99475920441.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/gofefuduxifegifelep.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/1387513960.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/jikafaturamojosonudokigo.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/73754738334.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/sakewizotewevot.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/64264244783.pdfIn PDF document text
    • http://sinoorchids.com/image/file/virapovovanipezewigotoboj.pdfIn PDF document text
    • https://ccskin.com/geektic/files/64739680896.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wuwefutesegetepezer.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/dokobipunosifala.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/givix.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/xikiputaxebenanafuriti.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/zezitaxenurugamomakojino.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f82dee2654---14547253498.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/52707522454.pdfIn PDF document text
    • https://kapefashion.com/files/files/kalalilim.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/xugoke.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/58346671665.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/jexebesegefubawop.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/tovaxomusixufuvokek.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/lopoxidazev.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c0f00038471b11b40ce467a00fa1a1e2/16746546180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vice+city+online+play+now+for+freePDF 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_off0000aef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF9 14136 bytes
SHA-256: da101e16f265c694cb9af725470439cfd1a578ba6b72eeabfe91484b048fb9b8
font_01_sfnt_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 10476 bytes
SHA-256: 3257d56782010877c505e12f835e34f5e40a2816ee2fff303b5a66e8012d3420
font_02_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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