Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7af5d09e05938dd…

MALICIOUS

PDF

119.6 KB Created: 2021-09-03 10:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: efeb861e54ac293dfaffdb2ad55d980b SHA-1: 04f0752e84e1cc7e6767fdde87e34335832763a5 SHA-256: e7af5d09e05938dd690103d2b367d4f2de9e26029924a6a7686afc2679d9c994
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-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://kondicionery-vidnoe.ru/upload_picture/file/64998192407.pdf In PDF document text
    • http://budoprojekt.eu/obrazy/file/tonuvobokopugasupapo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4eb2188c6e9c85e0dff523751fffc654/kikutukalivojete.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/53521681660.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9a4029087f40b1d36e20a975937b11f9/tapazafanowuwitefoka.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a58fef15c---48539798273.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/71171620016.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/mewupowixadalaj.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112620b65dd0---minimikodoxisotaxewu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/bugugo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/semitifobupezosow.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/tipakovesopodaba.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981d3065c30---7904739143.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/majagitotesuvi.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/goxidokuxobegukedowimodo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728d88b7eb9---tagogelizum.pdfIn PDF document text
    • https://birudongker.com/contents/files/dimaleporevofokezol.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/89079240378.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/12738072173.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210723214938-92040795488.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/12971732195.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/75984864956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=statistics+for+dummies+pdf+download+freePDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/98956815417.pdfIn PDF document text
    • 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_off00016e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E71 18540 bytes
SHA-256: 55e2bf25133de79701bab8dd01e9fbcdeeb601bfa7f76f059cbcc4247656ebbc
font_01_sfnt_off00019ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE8 11040 bytes
SHA-256: 7b127b9f1fd84e3d9e51ed88a90d9df9f87048f756a29ca167172ed6c34f4a30
font_02_sfnt_off0001b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1