Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ac3a3d700c53ba…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 09:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b330313f5d67dda6870ff53ff319bff3 SHA-1: 09ad0fff137bf6dc5da4f76e892b263cd9791137 SHA-256: c7ac3a3d700c53ba6a9a6a513e0d13e1f14ff7c7bd145bece655c9b316feaa13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=hunter+x+hunter+hisoka+greed+island', are likely used to redirect users to malicious content or phishing pages.

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://ketchas.ru/uplcv?utm_term=hunter+x+hunter+hisoka+greed+island PDF link annotation
    • http://penzionriverside.cz/files/file/tevibobalexerafom.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vugokenisovoko.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/rarubalisunumuwepakifir.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c65f52936---navizexolerekirorukobux.pdfIn PDF document text
    • http://cbstav.cz/file/lozedatudeto.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/78938687488.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/36785894084.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/54495527611.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/45045751266.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/wolumuzizepaveni.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/dovoribage.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/92718617191.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c115e8235e---ruvekuz.pdfIn PDF document text
    • http://haphadoor.com/upload/files/tunametunezibukazori.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/14692047289.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906205149435.pdfIn PDF document text
    • https://btegypt.com/file/gasexezutamikuwenapeferuk.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b9ec8691---kotafup.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/jodozutobaxo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/993bd1f25e89b7737e154e73b7441945/dolopik.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/70939607273.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/rubepupirapugal.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/77286484923.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/43571755545.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/75524546907.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_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 10812 bytes
SHA-256: c3ab2e1ca3cecd2980b44777a4a0a97c13f98ffb30ed56d8bbde79e2a4438c99
font_01_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 17908 bytes
SHA-256: 1e4a9bcc311a1c80f8ad91652cea79a8b6e2a9303d50fa041376fe66d44ef8f4
font_02_sfnt_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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