Malicious PDF — malware analysis report

Static analysis result for SHA-256 15685e06f4b85417…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 19:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7fc27a0c13a0e89ac29503a867f8191f SHA-1: c84a0f3b7be38810546de10e1b6c52748ea677e9 SHA-256: 15685e06f4b8541726969aa823bed6b542ceb8aecd41bb19a4e8df43bb4af5c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's part of a link farm hosted on compromised CMS uploads. The presence of multiple URLs pointing to PDFs on various websites suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a632bad95f4---17608118544.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d066741621173fb3753b5154f6d16a4a/85968003108.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/37059470921.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/vasomonasubojowaxurixeto.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/af2dcpkq94ub2t51bepl88agkl/lizozubaxopelaji.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/24929364897.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/95772344289.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e635a539---87885496067.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/68148832025.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/62307770406.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6365b07092e7ee14274de68b5dbeb2e2/kasaxoromomogovetude.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/08c2d36c374c75a37780ddbca748f8cd/turidasarugadatuxomi.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/53933006203.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/kasumatupiwokabigisum.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fcefaf1eae970daccc893ee9853dc37c/nerobiwujubilali.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/16bbb80caa2ff592f59340e293480817/73998673810.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/tuxevuj.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/gekapulikibivizareg.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/64864840671.pdfIn PDF document text
    • http://land89.com/ckupload/files/64708693912.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/49864603508.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bcd5a00455---kokifironogajavinazozaf.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9779f74ab2---29571698456.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/88415299839.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dafb31123d6dd945c1865cd70da3364f/tarokixosamituk.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/neviwalubiriwamujiwunula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=contraception+d%27urgence+pdfPDF 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_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 10744 bytes
SHA-256: dadcabaddbf675958e860ba91e2175f6ae4ef0952ef0f11e525a18026e5bd603
font_01_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 18456 bytes
SHA-256: 5ffcd87d5826ac052fb1bf4b89876033c3a495e0f67fd2df4af082c7aeba2f16
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1