Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e28a4fc0e3195e0…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 00:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c967861d932083548420cf0195eccdcb SHA-1: cfe1e742b482070b9f81328ff9b52c4cea5a1e9e SHA-256: 2e28a4fc0e3195e0c4a34516223eb3fcb00315e40765e33ef9ff582c4d0015c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to malicious content. The heuristics indicate a high likelihood of malicious intent, with multiple links pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection further support the malicious verdict, suggesting the PDF is designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/addad33634ee8062d529e72d0c5d7c31/jajemowe.pdf In PDF document text
    • http://simonide.org/userfiles/file/pofejigotebuxiwalinamil.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/tatonume.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gieui0hmoqmlbi4lqk893ekbuu/pekabojewozedetuveva.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/lonaw.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a741c605c---kuporinajubozuvolupafav.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/54054792629.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/74328417095.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/viliju.pdfIn PDF document text
    • https://svltv.in/userfiles/files/gifefazinitorikevotevenu.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/viwevetugagiwiponari.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/90840049490.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2198b4fce4---74822422324.pdfIn PDF document text
    • http://cobmedia.hu/include/paboxidemizovuj.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/63727627844.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/71317693869.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kqdlhg9qqp4nnad062b91ovsnh/88924737788.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sirijapaxugozibuka.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/65777881781.pdfIn PDF document text
    • http://idroter.org/userfiles/files/wovizonalobomenigog.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/mejov.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608854a9b920a---dabid.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f21rmdopekc1525k5ngg6ie3jj/66224563529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=right+triangle+congruence+worksheet+pdfPDF 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_off0000bd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 17596 bytes
SHA-256: b125e5988b58dbca9de98c69a9f9c81973d8dbc28ba6eb4dd615ac11dc1b80a5
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 11220 bytes
SHA-256: dff2b5b691c53f4cb73a681392ce728740b7b13014bb603cabee36c09c28c2e9
font_02_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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