Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f7830c620305f0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 16:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b518ef653a8925dc815637e5f51599a SHA-1: 1eb092677e1c689866119fd9ee944794c603e6e2 SHA-256: e6f7830c620305f04e1a6243cd27c5437a7688ebf19eed65c0a718a8a9750394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms on compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a pattern of using these links for malicious purposes. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification. The primary URL identified, https://synerhu.ru/uplcv?utm_term=minecraft+dungeons+cheat, suggests a lure related to game cheats to entice users to click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=minecraft+dungeons+cheat PDF link annotation
    • https://zaragozadenoche.es/upload/files/63481869598.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/tigavoxu.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/sejixodofumom.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/konegowilokevimakavuwabe.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/menonez.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/pasutazavuk.pdfIn PDF document text
    • http://badgerhillfarm.uk/mirupukudituzu.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/89739618705.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/ridatefo.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/33856953656.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/91892875378.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mafexavexirabonapeze.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mowuwizawinivi.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/106140567.pdfIn PDF document text
    • http://arucax.am/user_images/file/25434251551.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wogam.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kusexadiwaf.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161382a6d8af48---71816021716.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8af9bbbf---dewanegijejakizuji.pdfIn PDF document text
    • http://ustunongel.com/image/files/dafuzugubumogozivaxef.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/68725061426.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/fuvewuvirumopepi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/11453574407.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108a048fc9---boxafof.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/967180567a3dbd0aaf33c2f42eb7d46f/47709911967.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_off0000bb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB50 16824 bytes
SHA-256: 3f4c537569af6e3475b000baa38f887111ad65872e2d6732fc2b3f764d82c1d1
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 10800 bytes
SHA-256: 0aad8eff902adbbc78e1479ea872031199d89084ed194b6aa56279ff32d16e19
font_02_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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