Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20538979476fc70…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 05:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6896dcbeece41f57af18b5c75a42d729 SHA-1: a5a5c3f828992f0bb386be834e912ea9b41802ff SHA-256: c20538979476fc70bdc37d182fffe69401d881725250df46a9ef925cbfb50e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/23d216c3ffa11eda563e9518f8c9a872/96483027470.pdf In PDF document text
    • http://exhibitionchannel.com/upload/4653278850.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/73156640800.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/93831736430.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210910_185039.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/zabanisedunewevetu.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/sikijetekukavajifevadob.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/madubemuz.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/36558046783.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/67720508575.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/97276680921.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/10093681492.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/fagedato.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/13563162669.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pinobemiworusakewofigosap.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e588da148db06c955532de12e31453f1/15140167626.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/59913749000.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/27257180915.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/nibezapi.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/ludirujijuwijatizetu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bff9d36be---fiwazezemikasemus.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/zujavaxiw.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/71924554586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+grand+theft+auto+game+for+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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 10908 bytes
SHA-256: f2a8e0f3017004370541932657184d842b42da63c42f94682394183f572590fd
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 17412 bytes
SHA-256: 810d75387dbdbf6db95916e47d68c2c547201a46a2ef50c5312dd5db2bb14b1e
font_02_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1