Malicious PDF — malware analysis report

Static analysis result for SHA-256 e760db0364439e94…

MALICIOUS

PDF

90.6 KB Created: 2021-08-15 12:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed3ae5c57037036a66d64f1a36f3685c SHA-1: 0c521d40aadf925e435c3ac2ded50cd5ac2d2947 SHA-256: e760db0364439e94b56f0e1305a99c2eee8ba8014cac68af03ebd43405d2f128
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the structure aligns with techniques used to distribute malware or phishing lures via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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=kamu+maliyesi+ders+notlar%C4%B1+%C3%B6zet PDF link annotation
    • https://behbehaniprojects.com/uploads/files/bisevumexu.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dofelikip.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1d71f5d4---88915967384.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/sevuxusul.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145c2c966e---vemuzeb.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/47635487890.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4257d41239f1e3e68dc5eb8402f0035b/senavujulatazurenorov.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982e41f39c9---mifimolusonagugovus.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2f0c72e7---jisotewe.pdfIn PDF document text
    • http://askort.pl/Upload/file/16017230392.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/fabikef.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2007aa124---98319853409.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/773296762e581a0f0f35d0a1285a68f8/88368396899.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a30f42f2007e517898978827d5efa519/nosavixotodat.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/52201454163.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9ad8da84---mezezanelokugudimumubasu.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/wipadokonupinodaf.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/vakimizob.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0010dbffd813de9e505bd21dc7d1488d/23349151477.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21cb231e0---pidabovojatituvupu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/15novo759mnpu2nfbm9a7j3nqg/60128873902.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p3o385rm0p12t4sel3icjmmpk4/38432419682.pdfIn PDF document text
    • http://budka39.ru/files/72766585603.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/54175682461.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f4c24984efaf49b8b613079bfbddc0db/87441126438.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_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 21012 bytes
SHA-256: 69fffa697ad7c711950c9689c2be2c7dbbd3db89f23736eab5832bb304707079
font_01_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 10932 bytes
SHA-256: 815d09a2f9fea1c9627e6e1c64f809751a3909cb93a775d1c7a48cc1a350d5fd
font_02_sfnt_off000141b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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