Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eddf24fb020a127…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 17:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e45dff090cb888453f98f21d11bf5cd1 SHA-1: 75b889dd0d0fa4c8e3ec663b62cd983000f44943 SHA-256: 6eddf24fb020a1272e19229691066f726c23214758ba2aa36b9ffc64ae2beb09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=trick+or+treat+french
    • http://vksraja.in/fckeditor/upload/file/nejupulezexilijetinow.pdf
    • http://geyikkimya.com/userfiles/upload/file/lekuramiwepakegetid.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c6eada63a2632846b54a6d7d6b477417/basetila.pdf
    • http://volamtuyetthe.com/userfiles/file/kekebar.pdf
    • http://krakow4you.pl/krakow/files/10744127292.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/luruk.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/14249238987.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/budoroxadopef.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608278e3d41c8---pakalu.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18791d9165efceb3a5da2fee65491f88/sanotujoxabekezilazosuva.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081717e9682b---bekonopokovoxo.pdf
    • http://alkanboya.com/files/file///pikirisexusisofifopot.pdf
    • http://ashioke.com/images/library/File/19955309789.pdf
    • http://keitbg.com/images/files/70518255539.pdf
    • https://renebeumer.nl/userfiles/file/rejopetikedimolig.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3acbdf15a3---wenezobepi.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608408e7cfba8---gibisinowemo.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082faceb3a29---71508037280.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0fcaa7fde---lovofatabawavogipu.pdf
    • https://a2designbg.com/userfiles/file/gimevemite.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/5914ca096e998b96932672a1c2127c21/mesemufe.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609158acc51c7---6097261687.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3fm8uhukq1cib925cpsvajeuis/jimurovemorogibupigamezu.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b0nolpsa4mspdb78qr3sf6vuf8/73758444725.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f057.bin
c50d7956a635f01f582c69829f74280d71e3ef0dd5eb588ab3481066efacc1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 17748 bytes
font_01_sfnt_off00011e8e.bin
7ae2f31761300b4f035cd310411d0bcbf9bad27056abc2629837900fde7269a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 10276 bytes
font_02_sfnt_off000135a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135A1 16792 bytes