Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec430c94f839eeae…

MALICIOUS

PDF

86.0 KB Created: 2021-07-25 19:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c0c0db569bdaeeead6271700d2c82e5 SHA-1: b41502cb2ef671db321fc35b7ef4aa3269642b7a SHA-256: ec430c94f839eeae5a2044ccfd96546ada31417add2adea914b6c0650731e026
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is classified as malicious by ML models and ClamAV, indicating it is a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension, a common tactic for credential theft or malware installation. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, serve as a link farm to facilitate this social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://planet-for-events.de/userfiles/file/59122029177.pdf In PDF document text
    • https://landatur.com/files/galeria/files/tawifefozexesalimetili.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce27bb7f3a---32912561696.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210623_EE3D299B35C62FF0.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc1f36424---20353575111.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/pasoba.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/98438425454.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160871a6d08a2a---93462130387.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d62d71ef8b1---81346104506.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/82041524690.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4343165e770fa9bb97d041af217cad4/21467468455.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/19117943738.pdfIn PDF document text
    • https://parc-hotel.info/file/gefobozev.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/95617627882.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/losat.pdfIn PDF document text
    • http://rhondachem.com/d/files/jobosuz.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/bevofijedoz.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/tegusotirurepewifeta.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/wabanowa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b53dc3747---jewekunavonisemavofe.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708655aa80d---wufasolo.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/39394013227.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/karumiredisasakef.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/vifeserakete.pdfIn PDF document text
    • https://beliangka.com/contents//files/faxulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kiss+me+full+movie+english+subtitles+online+freePDF 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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 10796 bytes
SHA-256: 3f161a73c40d566bafcb92906f62071e5e3ded1b6e94ef27c99a48ba6c36ce13
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 16400 bytes
SHA-256: 45761d0ed32483defa2ebb98f31a9f642e4eb9b83419e07cc0a1cf513983934e
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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