Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60d3b090a4e8068…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 18:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 190468ccc8edd88a0fb1d1a6aedf4e53 SHA-1: 8c1afecf821bb7e385d767d830e42c087d17cd3e SHA-256: b60d3b090a4e8068d3b4f7f08471119b5ace309001e82b5de12a8785967e49a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate these links are likely used for phishing or to distribute malware, as suggested by the ClamAV detection and ML classifier flagging it as malicious. The primary function appears to be directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=snaptube+app+down PDF link annotation
    • http://shinyoungvalve.com/userData/board/file/kufumapuniranerevazejowu.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/juluvowepokotemepul.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/90169292381.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/52949061707.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aadfde509a---89862729820.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/34261807028.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/54175754917.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/tujukewifisukawiwiji.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/86807461257.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/wasajinuvipawudawi.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/90186463614.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/57869111031.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/vilopafabuxam.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/2087933320.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/16556348622.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a5b31aa630c84c0fc7083abf1e198bbb/werotuja.pdfIn PDF document text
    • https://stvorki.ru/files/file/91637281636.pdfIn PDF document text
    • https://rais.bg/uploads/file/71487178877.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/93106620285.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8de6fab9---xuwewodepo.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/85329561764.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/wizoju.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/21408093923.pdfIn PDF document text
    • https://andana.us/files/files/wanexika.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_off0000b532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 16488 bytes
SHA-256: 45741c75afa08adbee4a36a7ba197766c2d686bd71bd3bebf795b071b4cdc8b9
font_02_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 10380 bytes
SHA-256: b02ec216d3a54e193d2dbf39b75f90adcd18e3f86f25d0a99db28710ff20af90