Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1477cc0e9b02d1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 14:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4033b76ffb1a6cf671917450457e06e6 SHA-1: 08cd2579ff80d51fa5e3560383348583b6753758 SHA-256: 4d1477cc0e9b02d15301a1e61dbe71f0f916a8e8b168fa35cee750981196a7d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/73ef1dfe325b5602338ea88e906c0bb2/19917383163.pdf In PDF document text
    • http://vizit-k.net/uploads/editor/files/45333982671.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/35563315229.pdfIn PDF document text
    • https://penzion-palice.cz/content/82401302979.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gakaralajikob.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/rerikulefowilelopabotux.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cecb3416f1b3ecb2685cafa620ec7a24/rofavimovumefer.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/jutev.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/16328581353.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/sural.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/23309205011.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/79202683818.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/19902435243.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/35769693863.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/siwuziren.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/ledoforikime.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dd38fbe9---kizikojuvawe.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/80087557667.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/zamekakadazab.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/zoxoselepofexofe.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/2296796486.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wateveda.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/xavagezavodopigufof.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/kasoxanufub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=auto+turn+off+wifi+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 10168 bytes
SHA-256: 33d76d4bd3813211b1638662925f2bbb90be388c04b4fb7f6263ad7193907d58
font_01_sfnt_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 17664 bytes
SHA-256: 0d191b2c937e7fbe3bf48f58d2a1fd253ee50d19dc317ef8a5f166cb958fb740
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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