Malicious PDF — malware analysis report

Static analysis result for SHA-256 508e5b589c07df28…

MALICIOUS

PDF

142.7 KB Created: 2021-09-06 11:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 20b3ea617ac20b67066f921dcf33081e SHA-1: 089734a259cf1b49399573d6a33e981d6acea62d SHA-256: 508e5b589c07df285482c99714503367f43abec55023165bce5e4d0e1a4a54c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://aydin-elektrik.com/resimler/files/41906951747.pdf In PDF document text
    • https://amatnieks.com/pictures/image/69412784796.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210627_BC777FF13871445D.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2e4c1d8c---miwovajizorevege.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fce46b8cb---bebimafat.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8f19c5fa3430c83e01f23a8215b23423/27940376671.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/puguboduseripud.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210802082401.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wuwafogafadejijumigufo.pdfIn PDF document text
    • http://mamitobe.ru/files/file/rimemapaxunikarefik.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/63060751061.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/kupaweverogar.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2142721037f45086ea7429e320ea4ca4/247694949.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/57893714729.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/tosudepozuzaxabol.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/jurepafenidulivelit.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addb3dbebc5---fukiximaxa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/22009404441.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/bobovatigow.pdfIn PDF document text
    • https://ienter.bg/files/21274185713.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/dibepuvodi.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/megurepajiwotonadev.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/73636339766.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/22979203022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=adiestrando+guerreros+pdfPDF 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_off0001c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C527 10708 bytes
SHA-256: f46eaa136e5f4720b4b0b9158964ec810b5ff5648b1563bcb403fb522fe72bd5
font_01_sfnt_off0001ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDAB 21640 bytes
SHA-256: b115a37da1989e857e6fd84423888c8309d678cf408d05c0cf2b004c41717e52
font_02_sfnt_off000214bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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