Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4454957085a9a6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 22:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9dec8d5691220a1272d4aff88e2b37d SHA-1: 0284b56ab6ec0546e71d83ba4d29b7666f225a70 SHA-256: cd4454957085a9a6935fdbafb4f9c700fb893d8ff8443d8e71e88fb1ae9d4d1f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=knock+screen+to+unlock+android PDF link annotation
    • http://www.sushmitamukherjee.com/fckimages/file/5615140114.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a498bdc3---65633713595.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/74544645716.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/53207787158.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vogolepam.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395552d92a1---87486316952.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/82930703007.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/gupasomeladasexalezuk.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/65916266627.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/84676881597.pdfIn PDF document text
    • http://short-story.ru/upload/file/84956121040.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/81580378705.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/oripacff3jafsn8tpijol6lan4/56379858155.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/81909084985.pdfIn PDF document text
    • https://mahae.hu/files/files/26150938784.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/80655850319.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/parasebegopuwelapugeteve.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/21141088335.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/95410012792.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d95964672cc07c5cdadc95b58dfb7a8e/4250271061.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/zewakuziz.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/17343057427.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fapamivaxibi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/49662358221.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090917511773499.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/lobijebilosowuvutujimure.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 17988 bytes
SHA-256: 589730ab87b7053a266d7472fc7c1ad71011b2228b6b7166e7a295dc0940187e
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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