Malicious PDF — malware analysis report

Static analysis result for SHA-256 22eb0baee58ab7c4…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 04:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d70ce0f1def1ebbb52c89530442e3788 SHA-1: 01056b9d7c9c71f1bd92eb8a91b6d89accd458b6 SHA-256: 22eb0baee58ab7c455b2e31726c85d1efd53488702505eda1dfc082a3de16481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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://krisoc.ru/uplcv?utm_term=gradle+aware+make PDF link annotation
    • https://kit-veron.my/ckfinder/userfiles/files/3834446065.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435e14c82a8---54775090978.pdfIn PDF document text
    • http://linza-market.ru/upload/files/wigolokilaz.pdfIn PDF document text
    • http://kvrhousing.com/uploads/bubegegipivujuligor.pdfIn PDF document text
    • http://ymmicro.com/files/files/64402883728.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/nukimikemaj.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wasupu.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/47157562632.pdfIn PDF document text
    • http://vning.net/filespath/files/20210920173305.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/besofimeredisimi.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/13451290540.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/sanazexusegez.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/88758394127.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/zozikuradowisidu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/659106edfd7bd88cb0fdf311c5935c06/kuziseforosag.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/renajakuxasuriwek.pdfIn PDF document text
    • http://remobudostol.pl/pliki/nodedodezoronululudeti.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/5213867944.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/161303878.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/89845529450.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/21c590c3151027d2119c1b8e4b6df9c1/nigotirogoxipuxeragokiguj.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/44171907033.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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 18748 bytes
SHA-256: fc28ec6bee686d24b795641e1c320d47c5ec65a235b73737ea3daf70c8e5bd19
font_01_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 10044 bytes
SHA-256: 1d5df72b4829e969cc71421d76aef4ec1b0f6d7b64d5557904d32fc035212f0c
font_02_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1