Malicious PDF — malware analysis report

Static analysis result for SHA-256 179812ecc9a57c1d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 02:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dcf803119b4c258e52210a5d7dd5aa7c SHA-1: b42c8cb321619f3423b221ce170bfab4c0918aae SHA-256: 179812ecc9a57c1de3d5aa59b00d3ad7e9170435fce56bc64e17b792ad766740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to various websites, including compromised CMS uploads. This suggests an attempt to lure users to potentially malicious sites, possibly for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=best+torrent+downloader+android+2020 PDF link annotation
    • http://www.masozilina.sk/ckfinder/userfiles/files/kedose.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/23435322884.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/90494356852.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/bitazu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///80974788168.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/14767319189.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/abf183cb23c0d66b875c2a4eccce2f9b/84458828177.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/43781335083.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/94482101643.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/10133073770.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc5b92895---21827828877.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/munew.pdfIn PDF document text
    • http://becucci.it/userfiles/files/pofumuxejerotopovonij.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lerimuturopobebo.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/36890033868.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/namazunenizusipixa.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/33430090233.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/45172947168.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q8ik0hsiqkhj809glb85u46re7/36286553378.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9520c149d95b9b31effa171df07d0636/48665550675.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/futamotebepil.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/71511310882.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/11726511991.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161376f19946e0---15053953369.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/76144170569.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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 17608 bytes
SHA-256: 8c755a59e80119e0640c9da404006c4a8df820ee6694a4a2e2431b92c6b08e92
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 10624 bytes
SHA-256: fdca74eaaee0a996a294deba8980127eff0b9fcb69f87673fbb1076c42328797
font_02_sfnt_off0001325e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1