Malicious PDF — malware analysis report

Static analysis result for SHA-256 31507a01d0f9a641…

MALICIOUS

PDF

94.7 KB Created: 2021-09-13 22:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 304f9d1d1ae4ebc448fd51a6cfb122ba SHA-1: cde1929ab18eeda84b7f9bae8ce5c269d6cea661 SHA-256: 31507a01d0f9a64173e4864c41c7e3650a93692667dddc5f274ee1481836b097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alltechsro.cz/files/totiketemerodufoj.pdf In PDF document text
    • https://actionsporting.com/userfiles/files/zutufokevumubowu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/81674953690.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gaxivenurudisakerexetod.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kepukolajenasesarozuzaj.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/tapavodivuxiberoviba.pdfIn PDF document text
    • https://servicepapik.ro/files/55883581482.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/bojabuwa.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kamilibib.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/taxizemutivafofefig.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138079c39ba2---rogiwokitaporirikilokam.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0ff91a644---tuzavosobibe.pdfIn PDF document text
    • http://konberdbio.com/upload/files/mozinaxizoligefexexi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/569gg1tlbppua108d1ner4pu90/gojuwaboduzoboze.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/jasokuzuketa.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/58774003187.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mudovoramazejejileloban.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralasukadupizeze.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/9777723998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=msg+to+pdf+converter+freePDF 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_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 19836 bytes
SHA-256: 98a0e1bcb90c3023a26eb6fe91fd559b0a552b790fc7a1e123fb835a7f553adc
font_01_sfnt_off00013d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 10552 bytes
SHA-256: 72fdf984eb72d1afd11a6dfd5b50fb74734b08a0bd4a2f3e0f10b9e8773cb0a3
font_02_sfnt_off0001557f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1