Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6517348fb5e226…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 09:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 958e34e71342f7718b111e53a4f6d222 SHA-1: db4b8b3325ce6c8d25e6d3736d7e50c8c1b18359 SHA-256: 4e6517348fb5e226f1996ea0b374ea36ffb1cf836da4f67723317ad96695197c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=writing+equations+for+sine+and+cosine+graphs PDF link annotation
    • https://vocembalo.ch/userfiles/file/buzokide.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/ditafatinotugefegigem.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413cfc7d486---74591013353.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/72010342149.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/2469653169.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161316d4fe32a5---lotulasosig.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/45274832399.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/figixore.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/nubusetopeseroxuvewe.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/jolakulipuvo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b78c5d423---14002367353.pdfIn PDF document text
    • http://santabruna.cl/upload/file/zajekivekuw.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/sudafowovavenokigakatev.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/wevonedevikafekodomezida.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/45181585235.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/85890676010.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/pesoparulexagi.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/josaririxi.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/webab.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/30197064275.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef99eb6ac---bimunajumulononunuvir.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vozonoxinuzibo.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/ganafasolivotofesu.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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 11092 bytes
SHA-256: 3c17b48ca23016ab933f0ec5db84791a1f84b37f0e56f454129c28989d0928e8
font_01_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 18000 bytes
SHA-256: 4477c0639cb34c8327832ec127a2e70bef13ff5af36c70de59bdb03004f2cd3e
font_02_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1