Malicious PDF — malware analysis report

Static analysis result for SHA-256 563b3149d1ce1b74…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 01:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92e8c88ad7578cd6585c27b96fc5afa1 SHA-1: b828857cca6933422017b2d226c0af47f4e28a99 SHA-256: 563b3149d1ce1b74d8f4220802396ddd46590c87cb53384d6ab979f0a5fead6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=car+parking+multiplayer+mod+apk+fast+car PDF link annotation
    • https://btcauction.vn/hinhanh/file/22274300660.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210909111256.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/74461245327.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134164c445cc---90071063739.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b15865bb---wogoje.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/defijazafoxapinidoxize.pdfIn PDF document text
    • https://negaratoto.com/contents/files/nekasoponowawexuto.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613A02C0C63CE.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57rnc7nrgl0n91jhpvg3jgj0hq/3269319077.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34375595742.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/walanoluduvo.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89798371449.pdfIn PDF document text
    • http://househouse.it/userfiles/files/sewodenunewesede.pdfIn PDF document text
    • http://yuha.be/_files/file/49390357621.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/repuganotosemerubiginaz.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/90419226777.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/59822974295.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/rajiratoditupe.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/50544068467.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pexajegojalamefi.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/vaxogusetonami.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/bomolilaw.pdfIn PDF document text
    • https://auto826.com/uploads/files/67677786666.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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 17404 bytes
SHA-256: 810be256efc190342f9b194d521df674029b18cfdd6e07320529abf4381eeb91
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 11300 bytes
SHA-256: d3384372e832403a84825d1d3699f5c2d87d34e47098de77af8b9249799211a1
font_02_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1