Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3175d438cdc3438…

MALICIOUS

PDF

84.5 KB Created: 2021-08-31 21:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b26174ad7823eacf475aaf76d34400d0 SHA-1: 0c9a89437a23624ab794cd4b4d107693039f97a8 SHA-256: d3175d438cdc3438c47b2bd4107c906a0fbc09effe214ba7045695a28a1ed64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=games+like+fleeing+the+complex PDF link annotation
    • https://soechi.id/userfiles/file/58474585749.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fc42e78953a---pegamev.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a49331107a6d531001267c88a00b5840/23996474850.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/ziparukosifov.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80e5efcf0---97083712387.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/gavibotefureveroligijixo.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/jarojokavulonawexemotovop.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b2a390d7---58331051373.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dnhjffef6eisr4tsnbds07qbp5/38212541004.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/wodajusiban.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/76120070501.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ec5e51d5---98419462022.pdfIn PDF document text
    • http://omg.su/upload/File/fudexaxotedonoz.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b1f2cf31---lamusixozejog.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/55822295030.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/61c61d4b8d031ff2fd732f23a10499a7/97822100626.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/xudewulevovavugagulus.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/lerajovifibikexozupera.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vinarunizewebojusadexu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad15e65bb---wedixuko.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e65c3df---31045656566.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/degebasiburira.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/96357315051.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/27330066253.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/77189723095.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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 17172 bytes
SHA-256: 80f9a8cee817c4dce9da17c9281d7cc0c429bc0cf33e54668b7daf00a653d9ee
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 11060 bytes
SHA-256: 5da05d37cf03892021edbadf9722b9f1e6896320d254fd2798ae32355f258826