Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9a1eb2586857dd…

MALICIOUS

PDF

87.1 KB Created: 2021-07-10 13:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ac1ddd2447caa931fd858c9140d32f3 SHA-1: 5f6e53a235ab6560f092e85d98014b3bf658256a SHA-256: db9a1eb2586857dd7bd4c1be936cfd63fe0d5aa67ebe55b31abdeffd8ba295ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with specific heuristics indicating it's a credential harvesting lure. The document's structure and embedded links suggest it is designed to trick users into providing sensitive information, such as one-time codes or MFA approvals. Numerous URLs pointing to compromised WordPress sites and disposable hosting were extracted, indicating a phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa4772ac1a---farafibosadijato.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1357317bff---97972237239.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/7923589105.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a455eb2d---36820788633.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/52901543730.pdfIn PDF document text
    • http://innotack.com/userfiles/files/bosamatirusikopekidi.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/nasoge.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160731995c3d1e---liputovutewopew.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/28589689450.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/tedolawanilawo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1dbe9afc015e617b5860b0c33060b7ec/48215754152.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/918f7251be5cbd978693a6ed1b280b78/51443918079.pdfIn PDF document text
    • http://apvn.info/userfiles/file/pekowexu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c340d825---12818224593.pdfIn PDF document text
    • http://learningkey.org/userfiles/73895302416.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070773a574d6---14828637561.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160986733dc295---11354075861.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/lujare.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9a8780fc474364be90714c395d944b6d/fipas.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b554cfce3eb---53229458008.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/917a0a1f939b70cb2a3b53373b330d87/86971167016.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753be55608c---9641941211.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085afba1a1c1---58577873577.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a283299d5df---ginagebidatopupavo.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/67631120504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=marginal+cost+pricingPDF 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_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 10412 bytes
SHA-256: c3a16e7c3b56309c5955be9de94c65cee9ee0051de697f0aa43507a04a49b24f
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 17740 bytes
SHA-256: 4fd2214f192b6634c10c6a9aa203530cbbf8c433f1a8b7935535a3a0e64836c9

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