Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98944b8b7da0fdc…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 12:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92657a644bb429932d74419fb1f961a4 SHA-1: 558b314c50136c016bb23955616b5392114d63a7 SHA-256: e98944b8b7da0fdc24b885434aba7cc072ea435f8206af2fde6eb6bf7722b88b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links indicates an attempt to lead the user away from the document to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=present+simple+questions+games+pdf PDF link annotation
    • http://www.rannatennis.ee/data/upfiles/files/58735737927.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dc3d5omnhtpcsirl2rbjhcntn3/duvosojitevonoti.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///92892434020.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0b027ca8eedddff9333072d1d4335f2d/53295094788.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d158dfa374d90d7c05f59b543392e68c/kofovekosufuwivox.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5f76e89f---75146022583.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/56004396970.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/fbedaec3a1ec8cfa5bf54570d51890ff/10884134310.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee7b91c52---48487741212.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5ntl45u502c9roc2f1qq8p4n53/bitasukajibopege.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/bifiwuxasopujaga.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/99938218615.pdfIn PDF document text
    • https://businesslife.com/content/file/pudili.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9505ba06ef---tatufarimezadoti.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/43743365356.pdfIn PDF document text
    • https://apra.pl/files/file/fewiso.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/77204712673.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/efadimodo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zepalizinokibubot.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/92445031865.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/23888631574.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfbec13a4---japagubemukivelanuf.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/farabumazom.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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 15752 bytes
SHA-256: f9f5daafd9d0b187f6a4f27e5e8aef7101a3b4d2a61bd82cad0e626adf8b4b91
font_01_sfnt_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 11088 bytes
SHA-256: 6d35751192715e72339205c6fe031343472a34812df57744fa3c9109c719fed0
font_02_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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