Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae4a4cd39017500…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 13:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d20b226603d09dcd6b2c842eaf543e9 SHA-1: 2b089bd5f30c09947d4eaf43f1bfba85f8531ae3 SHA-256: cae4a4cd39017500f83aaef45a2a937a2dd092cb90fc07132096515de6f9216c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution document. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or hosted on compromised websites. The presence of 'utm_term' in one URL suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=get+paid+android+apps+free PDF link annotation
    • http://cl-pub.com/files/files/jesit.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/9980295791.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/koluvira.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/borexasaxotobalurufamarak.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d4b72aa1b9c319cbeec6233a7a58b6a6/73375124242.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pupok.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/88537223444.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/digiregifemibawulotivuk.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161323fc8df7fd---4970083186.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/nabogotipazoxuxenepolep.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210919_23726C0AAD2FEA0D.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/96683614413.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/juxovobadifu.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/77073385047.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/fireliromumemukesekoxi.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/dotudujelakuk.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/921659665.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/61194612925.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gufixojeke.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210913041544.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef8b45a59---buxitabozeguvapunuveka.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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 15100 bytes
SHA-256: 7d7ce1f7002b2c6e783f9afb8972fdfba7536726508c39d8fb99aa7f5a2bb497
font_01_sfnt_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 10484 bytes
SHA-256: d5fb6af274d38f288e55cadb3d7cd2eac59ffb40c9617e8dc6e2c3b4e8b0c7e6
font_02_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1