Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b707272b612f92f…

MALICIOUS

PDF

99.5 KB Created: 2021-09-20 02:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f387223c8c048230bfd594022da59b9c SHA-1: 92a091ae53a1d7b4ab7f98e049a495b80d53d809 SHA-256: 9b707272b612f92ff9de3a37a766ab6cec7ad5a81c43aebef491c4112dec9481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and a ClamAV detection for phishing and trojan activity. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://drafthe.ru/uplcv?utm_term=tv+manager+apk PDF link annotation
    • http://bubb.cn/up_file/file/tejufaxivunuwififu.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/popoxakabeg.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/28255091887.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e895b0c3c---fifojasavezi.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/nawunedoxipisukar.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/688188112.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/53449421488.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iq3hvbfitsbekf6e3smurq87o1/kowagovezepozelimivup.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631321607.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/dupufiv.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/56889960921.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/kodesiwit.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/67212115272.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140488f07d98---pimapereboviletesereli.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/mudotunowel.pdfIn PDF document text
    • http://gptools.net/userfiles/file/pewadejurasumanoziredisi.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/44392373472.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ad314c93---74193249849.pdfIn PDF document text
    • http://stonebreaker.at/lupalirum.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/puvanubadowobifitogi.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/20503916405.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/44939769292.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/befitewu.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/96390439695.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_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 19884 bytes
SHA-256: ae0d03be5c0355b7e00e6e6c159f0119a6a0603013a462fce45f8f33f5a67d54
font_01_sfnt_off00015245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5C 10192 bytes
SHA-256: f542cfcf5614cc7239bd477e6e993ac0e2bfd65376a43ef9051b8dade405f8e6

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