Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba06b72c044dc98…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 18:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ef68fd3d121a1d336ec23464e3c3469 SHA-1: 156dc85368ace0d1ef8800afd1e4b1e46f90a7ea SHA-256: 8ba06b72c044dc98631164b1ce5eae6ea6639b13a51ca0ef3e68966ed63739d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=classification+of+qualitative+research+pdf PDF link annotation
    • https://www.truck-transport.com/ckfinder/userfiles/files/jikeroxifaxi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b8b5127a---xidupebavujesiluzigimare.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/24980374227.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c8fe9a05931472be6f961be1b629b6d6/kamoxomegezokenobaxolal.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161341c47e5eb7---15654818015.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/duwifofoxenosobiragevej.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/makemupupexika.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gokusemovupejowatuzaluj.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/gegawefujuz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cm8t4svmu580pdr861t1m63kke/16228623905.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/62296989575.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8b69e4850bea9f420c03b7eaf686aa87/votujuruxumakerigawubero.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/58273892462.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/41764340361.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/da957e0bebf5deb6459e4eccde66941f/wavukeripenirevofa.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/38798340442.pdfIn PDF document text
    • https://argumentua.com/i/file/takesoborawirebu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8f35621d96033ea9a0010dfcc4a5e482/12793926154.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/61640961122.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/57260560768.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/nojenakofalud.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7qi377tq960cs64u2l2gr94b1c/99060029902.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/59219598149.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_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 11060 bytes
SHA-256: 60aea377312ce802ee72141856f3cb36b7a5512d3f8796a5c245a91f2ad88599
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 17352 bytes
SHA-256: a58ec1e148c2cec7342aa08c3eb961aa17384887dc82de28b453a8ab59a1e055
font_02_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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