Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c20a0674129777c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 22:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 159f52d5c8ba22059e4c1fa504a733e0 SHA-1: 8e351d54621bf9c8797ab2be41012714f1851702 SHA-256: 5c20a0674129777c8c7b4cf2dce1f71de545d6d7ec8c449288d20ec881177d56
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.channeloflove.com/ckfinder/userfiles/files/40522562440.pdf In PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/88581325292.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f275890888---jukede.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37404836696.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/87579726301.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/demazemazuwewi.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/67468221062.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/cc0em1a8j41qbtsg1nutvm3o31/36890484536.pdfIn PDF document text
    • https://edusfera.pl/upload/file/doxazuwuk.pdfIn PDF document text
    • http://kite-surf.sk/files/betazex.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/vixigeg.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fef0acf609---sifuri.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/91546432652.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/33084487671.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b460fbc2f1---rifobubidedefitukeda.pdfIn PDF document text
    • https://podimercrm.com/img/files/dunajonudamanegazi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/75956042620.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4990d621fec46d4dedc5b579f72d1c52/95820480.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/79479565835.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fitevukimeleze.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/gebexaraseriwitoporulu.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/gadexizeleluwewivik.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/digutazon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+webcam+windowsPDF 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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 10592 bytes
SHA-256: 96b5226ee2e324ab669726b884fb4679c5159bf8cef88c343d1b4f59f343fe9d
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 17800 bytes
SHA-256: 80d787a206ca85a2d036876c341baa0b0750071f91198038e0779ff0b4d31322
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1