Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fc81e1ea37a62e…

MALICIOUS

PDF

157.7 KB Created: 2021-08-08 16:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9c367770577c75bd1139bc4c3e9cfd45 SHA-1: 1db7cf12cd2bff0ca817a33ac4f367b6c0d746fb SHA-256: c8fc81e1ea37a62e12ee835c31aa9869e247ebab753adc61111fc3de918723af
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://wellfoto.cz/pictures/files/45081271720.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/aa7ddd21eed72e3ce1db37b5c198cc70/12648418967.pdfIn PDF document text
    • http://masonhn.com/d/files/ruwigot.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/gogefotugojexosifonexuvam.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/josetibijuj.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/gafamalotuniteg.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/5929989707.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160825fb005963---gabud.pdfIn PDF document text
    • https://kaimano.it/file/roriderefifi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a431bf419c4e47846de1276d34122bcb/39355926218.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4488546ec---fewusubagubutaritapibezi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/41533280465.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/lawupugo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb272b8ec6---13713232827.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/da7b1b2790788121d46af8453f08f985/wakesipipuwejidowor.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d70ddd31d---jokuwasukitideboj.pdfIn PDF document text
    • http://dentali.cz/files/files/fexotuse.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/xesok.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/23451566261.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/26027474458.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/gipiwexakubupefilemogo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b810639f4---judikosujozuvazamusakan.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aac81fb4b3d---xigisexeve.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1c3ebc6c---mozugaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fiche+r%C3%A9sum%C3%A9+guerre+froide+pdfPDF link annotation
    • 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_off00020345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20345 20556 bytes
SHA-256: ba3378e067ed137051b1322b3f7f2568b5b4858c216a9516f08c4f049d14cd46
font_01_sfnt_off00023626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E3D 10888 bytes
SHA-256: 6822018b6b3c228a36de2c14016c300aa33fed955714c512bd522123d7412e4c

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