Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f05d8c8dcbd65c6…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 02:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f31263bf21a1b1c14852a1915f73f1e SHA-1: 0c508b722ce39c885889fe2958a2f311116f0232 SHA-256: 4f05d8c8dcbd65c6358b2224a74bb941de99e13b22da5cf8515660bd567a6a61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=boruto+next+generation+english+dub PDF link annotation
    • http://duythuc-bearing.vn/uploads/userfiles/file/41433258087.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/bofubiwizugalijolag.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/janolevoxiku.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161409785f0734---lifotuzuduxubaxotefetoj.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/71824076790.pdfIn PDF document text
    • https://hoavily.com/uploads/files/88717539183.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/gonemozumoxevovekasedux.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/45052603857.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/daxugelubamerolopopovo.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/75169839919.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/51896582436.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/62537330215.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/17982805298.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907094454.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/42038098813.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134773548c74---88654093436.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/bavijoxixozijufak.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/lezujopa.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/46606048396.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/sisimitegok.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/4286483768.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/9768602680.pdfIn PDF document text
    • https://beautydent.hu/editor_up/xasugebogodanufutin.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/nibosamapilufapudukevofav.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/guminewugedujo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161431d5365068---suligadedakudobotudesox.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/779faafaf23a0e9550143fa5b32c8fc2/kizibabisaz.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_off0000cde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 17300 bytes
SHA-256: e185245413ccda331047db483bcb8eea7428f438b753b6d267025380d7d40ea4
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 10924 bytes
SHA-256: 30eb903832a676df3d1b73987fe5c9504460b659e543af3f9ca59abd60340f08
font_02_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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