Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f86472b79e2fbb…

MALICIOUS

PDF

88.3 KB Created: 2021-06-25 22:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2876f2c16bb3f5d55d8673bcf94d748b SHA-1: 7b08695933ef805b29fd021003b1a9766e977a7a SHA-256: 34f86472b79e2fbb7d71624469bf8f706e4fed1aaccc78ab904a69b977fe72d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=how+to+make+someone+interested+in+talking+to+you PDF link annotation
    • http://gabortech.com/admin/file/tokulok.pdfIn PDF document text
    • https://windsbs.biz/files/file/vuzavakabufoboduz.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c173f8cc71a972aa70dc3d908ca67e97/82716247637.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27272e681---rarireralox.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/mizavoreminitiletu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/19599419270.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160700c9ec9b20---wagepasazojezadotum.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jqt315lm8263h8f2apcbirnp9u/ginuguwofade.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/54963266791.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/geveju.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c8d308ee---40749111365.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/27079536872.pdfIn PDF document text
    • http://dnepropress.net/files/file/89792770125.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/62747451808.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/kerinobobuzojirodatutede.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b0b370922f37515cb0a5a8d811bf4812/dubisidejuzopomidazoki.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/885cca02d156d576462371608f8da00d/besamesakidiga.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/vofanuwinufizaniwuv.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c82f7f450---44741570026.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4353667854.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d12a1617cf9e03e3e15fab2138cd841/26387710807.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96f75d307---lotivogepudilixakufizezav.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabff0dede---91698711930.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gc69eq38mbdh4quj06rg32na49/76387431418.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_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16988 bytes
SHA-256: eceb50e4921662d2a67f5d91e5f77cbf4ca2e0ad523f17e58962707112ef03d4
font_01_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A76 10972 bytes
SHA-256: abe33302c4631c01c3b8526700bf11821fe99dae12bb38387ed9a69a6ff6e474

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