Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec46819c63b897e9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 04:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21c2a8fe1f033396ca95219aec456b59 SHA-1: 0c9c729798f18cb1e355c29bd5870772bf9b6124 SHA-256: ec46819c63b897e951c96c8ff7c8d16ae47a2136d5aca6c07ba38c28e93e54cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure victims into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=java+concurrency+in+practise+pdf PDF link annotation
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffcaec64da---denefobat.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d50783e1f---makekededizinofokusidup.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a934f00571f---68839934674.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210816174121.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/56425874868.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d21ad8329---fasawabifakufefe.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cda89f6cda9e5cd86cc3b45b77d2abcd/95442608348.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/ravegifizipag.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/feroxefo.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/dcd5089b10fa144047f60fd46db3326d/bisijutatewifuli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05899193e8---xazin.pdfIn PDF document text
    • http://inistor.com/ufiles/files/dubofukapigamopukefe.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/desuf.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///vegogulinufave.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/98462267171.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hqi3hln09gssvp364lqbcnhlr6/84806367765.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09b5fc04f6---famalodusufagewuguzaxi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/43531784741.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62692861457.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/20317992124.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0df63d3014820d168396de1b6c2da6d3/dimizoronokejasozatubu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6b18f096---60241316327.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/35283115997.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/51710194336.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7b139c13eb33d509fb24c4a7eb23767c/3571693724.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_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 10840 bytes
SHA-256: ae130f0f79b054749d0a2fc305301aa4925f6bf8ac18e2298911fe2eaee64fa4
font_01_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 17408 bytes
SHA-256: a2e565661ef83d42cfedfa1c1cc4a078e53d8e5935321e2b4d1b934756405812
font_02_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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