Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e760c424150903…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 13:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50ea1ecdfed2877ec255e4eee53ded42 SHA-1: 671e3a5dece2f6c0bea09a3cbd789c3b5b5b76c1 SHA-256: e7e760c42415090300e430a8df7e9f5911623ea3a52e32f5a5fad99c4e58fc34
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension to view its content. The presence of numerous external links, many pointing to compromised WordPress upload directories, suggests a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and heuristic firings indicate it is designed to facilitate the download and execution of malicious payloads, likely via exploited vulnerabilities or further social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=3ds+hacking+2020
    • http://ji-tien.com/userfiles/file/kuzaruwixawizutor.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac604cd81d0---ribupe.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0280e1e873---63313848200.pdf
    • http://kubabus.cz/novy-web/upload/file/77813053863.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e88173ec4c---28440144230.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d192b13cb---45801596112.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0189d8acd---mafud.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a522132a6---genuguniduvotewe.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/82242500918.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16097d36fb33ea---29339319497.pdf
    • http://hjtech.org/admin/upfile/file/94179351340.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/113a2379b766f011ee9a04687046b9ed/kupisagunotexiravamu.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/89dda0a1af405299e06464573520f3bb/33937093145.pdf
    • http://php-lounge.de/userfiles/file/70679765313.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf47249622c---82853540518.pdf
    • http://gialtour.it/themes/userfiles//files/55741054573.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7e352a9ba3841664cbe7b67bff5bb827/pupemogarojenijigelipuda.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7166f4fc4fb7e6bbc2bd8f873512f53c/letamikewurakofivusego.pdf
    • http://shengnabei.com/uploadfile/file///2021060304290991.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078482cb750d---39721370956.pdf
    • https://abugfreemind.com/userfiles/file/10306344950.pdf
    • https://veterinarycarefoundation.org/userfiles/file/88253472825.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8393e30a---fojupiwimerabozuninozap.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cac1765d---16963649934.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ttvisbro6o2veung861olj25bk/sarosalovimijejixarapux.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cdfc3164---51946521610.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb2.bin
58d0c4a5a38f5d0e3082211525ad01ea77b2ab0b804c2a6c16dcc70ad8586000		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10564 bytes
font_01_sfnt_off0001078c.bin
676693d1c0cd733a670c91244a3422c3e36dd0a7da45f07fed41e3f88328e546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 18492 bytes
font_02_sfnt_off00013763.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 16792 bytes

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