Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ec25165a4925d2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 19:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2880a6c141910e2c384d72cb69b1b097 SHA-1: 7708c060cfba5f4f01a439f1639d98017fbaa566 SHA-256: 73ec25165a4925d25a2e297d1ada2c1257435ebf4e09804ec246de1ad0a2d992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=synthesis+repertory+pdf+free+download PDF link annotation
    • http://elma1.ru/!upload/files/80869945148.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/luwofajiti.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/65034333000.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/pakuwalebugujavowebajubev.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/xaronilepa.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/xopopurobevakowig.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/vulipiruxixexutiruwowipa.pdfIn PDF document text
    • https://slide-bearing.com/d/files/99097702277.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1b5bdbc5---43145551775.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f4at2pv079v9bklerqr13stoh/38000515005.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/89de8cd8a0ec7027f4d9d1be62b52ece/sefome.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/17997868561.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/6778494741.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/71862902206.pdfIn PDF document text
    • http://viettruss.com/upload/file/77310545784.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1cbcccba---dunupewoxomebasazanid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33864d6b63---gotusubojazosemuzizaxewor.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/14538799902.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41256d75---fudefup.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70f584da7---27522756854.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4a27f59d509f6419927c7b005328a657/29527102776.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/m9mpv39kte2ekf8a5s7daqod8j/19814544956.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/84662023146.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/f0k4qcavtmpvhasb9dfuov70sl/24150539549.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/rebizivewuk.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_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 18056 bytes
SHA-256: 3cad1f041703549b10d750aac36b53b7cbff06fb1365f92b8d8246bb840c7a20
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 10872 bytes
SHA-256: cd8124f45ae74b18731b673783682f95aab321e224ce98461bbfd89c6d53a8f2

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