Malicious PDF — malware analysis report

Static analysis result for SHA-256 f121997676f196a8…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 02:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea0773db8451ebee0c50487f8cb6ae8d SHA-1: 9faad727a06fa367d48c2cb398be773c6bebb7cb SHA-256: f121997676f196a8ec34b133623c3bf24563dc3c1f1d4a77736ae992794da9e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites. The PDF contains embedded JavaScript, likely used to facilitate redirection or further malicious actions. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=sitrain+training+for+automation+and+drives+pdf PDF link annotation
    • http://rmgoals.com/userfiles/files/tosakowipegupatilireji.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/raguxis.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/kunofojimafujajewofilolo.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/47343443920.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/bunemugumavitujed.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/4048556672.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/xubaxavebakotekafal.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/raperunekebudizazefopif.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/digepebeliborujogowugoro.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/91153073131.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/16991148654.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614032b323a6d---kifobexasotedoxunemus.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/14369368129.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8ecb1545---34149861753.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0a181e910---gepuz.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/13827871358.pdfIn PDF document text
    • https://hgb.se/filer/file/64981738361.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/70523354059.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/fazulixenalat.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/94800701834.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/93529049548.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/98529503375.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/7953477594.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_off0000ae28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE28 16680 bytes
SHA-256: 78cd887cc25c5ac75660b0e5bd2d99ec5a8a5c8a0c64ecec32279785c7d8e976
font_01_sfnt_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 11036 bytes
SHA-256: 8a0b3c0f08cbae538e9578ad99be9c2fde8866fa09b91a6136aa4017abf6b6cd
font_02_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1