Malicious PDF — malware analysis report

Static analysis result for SHA-256 f590792b1c26869a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 07:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09e43bc52158954310dabc5dbd979d66 SHA-1: 0e5f1aab537e738788acc882eee12ea2c8ef3a1a SHA-256: f590792b1c26869a647c96c4d171499daf080bfae43bb05a9aecb419aac8e56f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://wastran.ru/uplcv?utm_term=sciatica+patient+handout+pdf PDF link annotation
    • http://koreaticketland.com/userfile/file/kilifawisomab.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jevebuvowovifonukeweko.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jifiri.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/natinu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/wumofolugaxemilutufugegop.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0e9d88824a272ffe1b9653b61342b7e3/dazosa.pdfIn PDF document text
    • https://birotex.rs/images/files/magugigopazosikezosi.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/2506417006.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/20586077342.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kalakupatavosi.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/74068391552.pdfIn PDF document text
    • http://toroisg.com/public/images/files/35264859799.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/636625333.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/3503775568.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/wiwoneg.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/desozifemekupojapuso.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/gofomogevetigapized.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/7297894001.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614118e25255c---falamujixikenebivexuv.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3dg3hn4jlt1f8keng0su8ugds6/rosiwuwaketelidagosik.pdfIn PDF document text
    • http://voijin.com/userfiles/files/mofij.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/58016701303.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/53645432345.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/38733042580.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_off0000bbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 10576 bytes
SHA-256: dc73710c366cc416445d7d339f73d299672acf6fe40c51b2fc1c82dc09f2d806
font_02_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 15688 bytes
SHA-256: a4648d81de3ffabe59073cea5a281b6a99c438b6cac171fc64f39c2cbf1da90c

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