Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fc6166d8a6abd9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 22:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 521df5e79c50818963fe220f6b87bb8b SHA-1: 4cd0bef87c90ab5df2f4619a0b38f179cb8390ac SHA-256: c6fc6166d8a6abd91c09d4457d0f0bfe649cb98b5e8a42c771f73e671dfdcaac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous links to potentially compromised websites indicates a malicious intent, likely for phishing or redirecting users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The document body was unreadable, but the heuristics and URLs strongly suggest a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://parfumerieindex.nl/images/uploads/4705074116.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ec74778e6---8377820516.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/25525755058.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/luzogojilama.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/sobep.pdfIn PDF document text
    • https://bak.vn/upload/files/26252350959.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/90410675719.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cac607e51dbdd8e8e9a152825a038a50/daxezirogiwanobubub.pdfIn PDF document text
    • http://bndweb.nl/upload/files/tumovifinemi.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/70033499145.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/fugiwoviwagibeduvu.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/kaxumom.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905013729.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/770efdd555e605a1e79d9940c6c5c8cb/17722761421.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/32116437151.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c550f4edb8---vemadefajidubifavopiniruw.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/32289795092.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/tezivuwi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/25984357095.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/wemonatedibanajagupazug.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/sadajaba.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/72715892385.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/21768119352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=final+fantasy+3+ds+romPDF 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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 10648 bytes
SHA-256: 1ce71a69f6bd7612fb861a809879218e81cdaf75d9b8ce39d7ad83049bace3cf
font_02_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 15960 bytes
SHA-256: eecaa4e56df27e6bd656eaa7898a5716ba81ad212ec908d545ddc77450e5ce88

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