Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c551fb6ae25662…

MALICIOUS

PDF

96.2 KB Created: 2021-07-15 22:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e1e07e10c602355dba7fb8227ecd5440 SHA-1: e092288218817b1e3a147e0f030553099d9f3258 SHA-256: 26c551fb6ae25662aa8be5f0870652d5591688bc497d63d2bf81fc40742be922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier strongly agrees. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=mcqs+in+medical+microbiology+and+infectious+diseases+pdf PDF link annotation
    • http://mastrodibaglio.it/userfiles/files/92955096559.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3d56832c---833008775.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/goboburexidijiruminoxewuj.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076db16b2503---notezenojorolu.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/fozakaxulisimemorogupowe.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/zowawunukunazanirekejat.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/kimowi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609623075f5a6---fazatefoguwipovif.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/kukixebudowet.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a358fd76779---tonenusoto.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/21530220162.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/levusadoxubomilegal.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mixam.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d2137045d05.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a695a940b4e---nijaluvoxisuz.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/ronevoresovidazepaj.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e54c7d188012263366073c37ba3db4d9/72545775158.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49032fac9---23995830956.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/fukogadibivarajuz.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/624e634ac14f1445dd6789b0bf0ae753/pilusetujowokodijutof.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/48897630804.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a73b9828---79581001380.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_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 17604 bytes
SHA-256: 6d6227d73ff6cdd149ddc610da75ccb477ef2eedcfd03be2824dfcdc6c19c509
font_02_sfnt_off0001589e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589E 11456 bytes
SHA-256: 69ee94a183b616ea85df6c1d08f77b052164079eed204a7fbcbeec932f83c09c

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