Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d42d31260df5e18…

MALICIOUS

PDF

80.2 KB Created: 2021-06-07 18:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f8027a6a452db135caf0663dae96a74 SHA-1: 974f7487d5225f7357af74fcfeaf9a9464b2c6e6 SHA-256: 6d42d31260df5e180068ca083e4d7b037ebe5de22eec6a2b9858f94f78f06b9d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress uploads and other domains, likely serving as a lure for users searching for information. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=cuanto+son+100+gramos+de+mantequilla+en+tazas
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6a1496df---jenudonafetedemujetu.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/d809njcc14j6erhpb32sk3a633/tisalewemabifiromo.pdf
    • http://garmagostaran.com/Upload/file/batavunobokane.pdf
    • https://agatanorek.com/files/file/89518001412.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b6d59141---sepowemikaji.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7h5vgqusf41ng6ntb9v165fg6j/65633453895.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcaf73f67---18435478785.pdf
    • https://xanbiente.de/userfiles/file/28701426230.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925267cb384---damaketokotew.pdf
    • https://balajitutorial.com/admin/userfiles/file/71934317769.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/80661ea87eb82ea2961517eff12d3014/texoxigekumakete.pdf
    • http://www.sport-konyv.hu/userfiles/file/rufawolusu.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8353fcbfb7f94a77b73799bfaeb1c532/29884892405.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907593dae03---fufugurimatisuparag.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634738ac96---fibitavexevoxoresawafulon.pdf
    • http://globalquestconsulting.com/userfiles/files/luxip.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a5f43b92---31425947145.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb0.bin
9459d895d803773931999a84a3db5910cc0dab57fe48feb57a0f75ce3a255760
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 5420 bytes
font_01_sfnt_off0000fe06.bin
52e30f5735f99fbf6501712e67f3f2d8f3640199e73edb017bf731db4b2a06c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 12136 bytes
font_02_sfnt_off000124dd.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 4324 bytes