Malicious PDF — malware analysis report

Static analysis result for SHA-256 811382b6f13266f9…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 01:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8725b1937197ff51a3fe560508d91509 SHA-1: cbfdd595834658c953e3bbf323ec052f083aa6ab SHA-256: 811382b6f13266f9f0818dbb22a8a825bde84e1289e5b2e2d462481925f8090b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=ppsspp+game+downloader+app PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614505f78ec21---fatalibamokafugu.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/newubopodepil.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/27029344119.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614478b32a813---77129600266.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b417b41017---furofukegi.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/folanuxidipovefu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96318f6d8---joloxiwemasijotizab.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/liwapomade.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/janosalokiletefare.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210910214922_547854897.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gojarajibixovamu.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/wobetowetulatesizowel.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/jazuvevujimatenoj.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/68442735668.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/73408007767.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/14969fe36b89c82d231fb3cfdb8ac5e0/geviriwiketozepefapuj.pdfIn PDF document text
    • https://robertbah.si/files/file/87886158712.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/71412223903.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/rojisunorasopibek.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wexujupipolisuza.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/9346938759.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/miranujigifulofomonobuj.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/47103375708.pdfIn PDF document text
    • 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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 18864 bytes
SHA-256: b9a4b31df168472e6fd8bcbeda20204f3a3f37aac84fdec7d972a75d28410f1d
font_01_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 10632 bytes
SHA-256: 463df86f9f62ed5e17495c3bc668b30962209de92d8bea0a01a75d537e5272c3
font_02_sfnt_off000136c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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