Malicious PDF — malware analysis report

Static analysis result for SHA-256 862abf43f2255df4…

MALICIOUS

PDF

118.5 KB Created: 2021-07-08 03:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d2662030da718856e91959e3ee3bc99 SHA-1: ed7a35cd6b0f666ce4711c17583cac49f3496e14 SHA-256: 862abf43f2255df4516c7e1b17ba89d4f5422be1a21f1f96eb7e571e786392eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination through numerous redirects and compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=what+are+the+three+mendelian+laws+of+inheritance PDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d2a6ba56097428dd1f72bdfc6b35fafc/suvuradovodapige.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f5e35f32---fomanet.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160821ac5425df---mawedakorur.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///foluzexofofepo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/77c8661c4697c4f7579db9317eda53f7/wedunuzuvuzuw.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/dujuf.pdfIn PDF document text
    • http://0930actress.com/files/files/30977857706.pdfIn PDF document text
    • https://synersys.fr/contenu/file/37844746652.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5f0c61474---33821852539.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/zugurexef.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5aa37557ee12b510a93781c7c03f3f25/31664380117.pdfIn PDF document text
    • https://actor-conseil.com/files/file/mikisizukadapi.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/texewu.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/accdf0e66d5eeb3cdc7aafddadcdcc8e/61820359104.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rgma65da4d0kc79qr06dta4hdb/83781297729.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/u5jvb8u4p2odrj3pefukfcgam1/zigiwenenamazelikajuz.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/15070942401.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c891e5e3---jorutezuvepegunodepaxaf.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/sunajexipot.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1glvt69aoienuo0qfhtj68lfj7/gosokejikesop.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qtgbhpci5dhck1folgfouq8a65/sezadafu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4debd0c4db---6315019886.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/14317822395.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gu0m75lh7ltbi8q36bqgiu7sgh/zetogigujevifegudizuni.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_off00016778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8F 10820 bytes
SHA-256: 679122ab63cfbd75ce229fcc3470249d6b284145a972160d3ed0a43761ccb537
font_02_sfnt_off00019866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19866 18984 bytes
SHA-256: a2f6d69ba7637d8d9132047e7fc7b1047f45ff0618e192309ac26bbbfdcf1b33

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