Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cf53694f8292f2…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 11:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 698b7ae020ba334be5fef7f890e2b3d3 SHA-1: 4d72b779243350ee6bc47dc5c04f840c09c21e5d SHA-256: 30cf53694f8292f28c2a62a69b5b1cf11197b3376a8acd2f559562fcd9777349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+studio+add+language PDF link annotation
    • http://origo.ws/userfiles/file/kewoxipaxezuxedojaronajo.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/kafovovurovelej.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913082026625452.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9506ebe0---21332715780.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/nezonuzemez.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/suzukimiziwunisesajive.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/85201353132.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28eef713956d1e33dd04ef6047a3ea4e/22460061245.pdfIn PDF document text
    • http://fructusartis.com/i/File/fifolunoxapufinenimoko.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/53043667295.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/zixuzasuvarafoza.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/nerimijinipizeninixodabi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32bc01a3---62672552968.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/28639453043.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914141029.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb76b9da73---xekulizowebu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/gezerukirivasadurewamik.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/xasolivebasalasi.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/19487891369.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/92651506530.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/20248954339.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f118fb25685e6b7837f378311729d3fb/sasoguruvopofetosivaku.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/42162330701.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/25766142539.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_off0000b670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 10504 bytes
SHA-256: 78f26e0ca39c08239b1ae061434e321606804b2606388b7210eded6f80d3b5b9
font_01_sfnt_off0000ce46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 16788 bytes
SHA-256: dc5da1450fdcfe54940f269d0c289308e6721861ea3746c195f768226bb0c99d

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