Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c06b0890050526…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 10:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 19ef4b07e0e5c0662940f93a2da3c6f1 SHA-1: 1693a3f0e1034805d6c8d2bfb4e1dee89f56a532 SHA-256: 78c06b08900505267167f9005cd9829b6ccc65608d8e7d8561c14c05916d30cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

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://oniceh.ru/uplcv?utm_term=how+to+roll+my+tongue PDF link annotation
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966644e786e---55992631215.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b63f5eb04f5db32c741b67dd7b8fb30/73061571709.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/99274033058.pdfIn PDF document text
    • https://clinicscrm.com/img/files/9986001533.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/0af5209003f119f0ae5b4e53b9c9d81f/23551144479.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c386ceb1cce---xiroxerororuxavodidok.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7bcfc3bc4---xutonedi.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/69329056614.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7acfcbb0452b0d0a59b55f7759dfe7ba/65453960373.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/81996558927.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/34035387606.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6e993ccd---virejerubefo.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/guguzuzanozutewibaxilasow.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/falira.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/77365465557.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ngs358ti71v9gmfscqsf31fudh/puxavajurinozuseliwa.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/58202948861.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/894cc165b42c2192576bea753d8e109e/37519745872.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/10627717648.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da3abfd27---tevigasaguwil.pdfIn PDF document text
    • https://inncredel.com/uploads/bojivozufili.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b6b61eae---velalizoboso.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 17072 bytes
SHA-256: 27bec7c9c7ea7a7c67fd869b002d295e03e5e5dd20e60ec45061a2a2a18afa87
font_01_sfnt_off00012cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14514 10320 bytes
SHA-256: 229734e8f1fe5d26a1fa701566629f6dee64cb7c0a98f0806c7ea66ff98a7030

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