Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd3c7ab9a2d9952…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 02:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb0a76554069e6d51de255c5e75c661a SHA-1: d9b75a45d3e028fd9478dfad4dae4ba5239d6a3b SHA-256: 9dd3c7ab9a2d9952ff1526c072e38e806959b2cc0cdcdccd2812edf1a38c06a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The heuristic 'PDF_IMAGE_LURE' indicates it's likely an image-based phishing lure, designed to trick users into clicking through to an external site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=free+printable+compound+word+worksheets+2nd+grade PDF link annotation
    • https://bakwanudang.com/contents//files/52551281153.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/39515240965.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/eb82ea1fb82c8b184006ece6ed556c42/49499079008.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/tawubuwevi.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1626416979.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d775a0f6d18acccf2bf83e4ab8dfa63f/dofuwasowopelapaxifokof.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/5986584661.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/dixelikudubenes.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734f6bb02a---wimolatazapezopota.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210714_051415.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/bivekonepadulaseziwepup.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/pemaxojizudigovuxal.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cf8584df---71040594165.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7d0fe247f---zowitidadixazapokekujit.pdfIn PDF document text
    • https://kawanmto.net/contents/files/wijujolul.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161218bddd28fd---62789962513.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ed9a590a---nojupo.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/79133956682.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/47100942862.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/togixudabopovupofe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d1e5993a---61546941750.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/86267393122.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/38425607770.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/17013258307.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_off0000b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 11476 bytes
SHA-256: 364974348ff007275e62e1134c262026dda0f15ab17d3dc93a6d6ad5ca3f14c4
font_01_sfnt_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 14364 bytes
SHA-256: ac51c691a592eb7c895c16914dfa15c2377c0ba1575da74539443a1c950a3a27

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