Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b114e349275ed8b…

MALICIOUS

PDF

81.8 KB Created: 2021-08-11 20:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b35273926dc97b65466891f04732704 SHA-1: f48a018c5da8f303651e37c5525688ddbd02b163 SHA-256: 4b114e349275ed8ba043dcf5f28143df685056f19bb0ee743285a30bec201ff7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The heuristics reveal a link farm strategy, with numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to lure users into downloading a payload like 'download txd workshop.exe'. The presence of embedded URLs and the overall structure strongly suggest this document is a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=download+txd+workshop.exe In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/88b0f3d30272ffdef0a619fd716bbf2a/letufu.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/latevubajitutemasa.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/sobavopugetufamofimus.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7e72be960689e2daf77c33941ccd7cc0/ratokobaz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607630c03f7dc---zizevuzazowutopavixukemam.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/21297248068.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/49475814663.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/d0ff04f40b610312fd11a4bedfddb64e/fekiluguguzudo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5327294a2---57472744655.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/52526387630.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/debarutasenem.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3cf97fd230bb54ef9514e0a8a440d20e/32388503143.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c52cd6c1d68---73831240854.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/xavuvarul.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kalafujutilekowero.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9abaafc9a623bf24015956cacfef2fb4/12386090748.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/zezejixoluvilosidekapevob.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/4454175040.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/34085944602.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/6400700121.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3e14a576ce8804136848c2326a0a5b05/22971723577.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o1gd4bmeloqi36d2472g4v13lh/pizifadadogesogidez.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_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 21440 bytes
SHA-256: 5db2535d637aaedc4c775fd0d0a8031220254d57a3877090da4c7fdc05164bde
font_02_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 10744 bytes
SHA-256: 2f1971ad6fafa769879bdcfe95018c62d09c3541365cbd646d9fbeb6b6ada400

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