Malicious PDF — malware analysis report

Static analysis result for SHA-256 463164538b2d4a70…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 14:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e750c7156c055ebedd1f57217270c8f SHA-1: 519704c5400f116c35ab78cc312b24b0d4f9458d SHA-256: 463164538b2d4a706b04135aa521733c5bb173c4f8b482ff5930236cd3ebda12
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristic firings clearly indicate the malicious intent of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drakbera.com/ckeditor/ckfinder/userfiles/files/91755156955.pdf In PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vilujuwuvafosukile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ab7e750b---57327843811.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca80ec454---93390169925.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/rupijatokid.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/50463365047.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908172539.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/pogokidagotokulofisekaro.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/51085181622.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/nukamanivolageg.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/vumejezuxuxexufez.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/29463722808.pdfIn PDF document text
    • http://cartopack.com/Images/file/benitaxuwababexeme.pdfIn PDF document text
    • http://shahgrp.com/uploads/wowavugatubogasemisar.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/nenojevomexiwut.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/7398518229.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/lipozabepunizoxozure.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/pinojafefoxukuzujitasaz.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/belus.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/35906816640.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210906_FDEA2E28C82A09EB.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c48706b3c9ef62a4b90fbfa58a93848b/nuvotakudifibage.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wesujuloxulufitivi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/kabagabano.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e569e9c08---babojelogibexalutoragalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+country+with+the+longest+namePDF link annotation
    • 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_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 10968 bytes
SHA-256: 96e18edd98f5de97d2351966df7fba3e075b9a245884201e1ee8964be5cb2e86
font_01_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 18216 bytes
SHA-256: e9a9d6dc2e389b90e3671b103746be064c2202c88850c6a69c0bbee8f1c8936c
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1