Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6d04e7aad84ddb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 06:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4348faa1698676713bcbd3efbfb44861 SHA-1: 39a250cc781d960d4eaca94b2b2e019b3eab188f SHA-256: 3b6d04e7aad84ddb87d92334e2ae25042002476b98fb366031f1616d0f597f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm indicates a likely attempt to redirect users to download malicious payloads or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.ferm-matic.fr/upload/file/dugug.pdf In PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/zewodofinin.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210907104707_tejwgy.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60858953747.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/71378642264.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/piramesaxagaver.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/rozerugoxawokiretotozaba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374082a2012---80846104920.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/vesazubot.pdfIn PDF document text
    • http://balone.net/_upload/file///57729387135.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/23839983354.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/47560727505.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90c31820---raxikasoromufamofelefuso.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/98665885803.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/gipitubekunaxivi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6d386691---12153610280.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/85103884875.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r0kl07bntbpsn5no53mcs4f5o1/7649942672.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/66957679343.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/67530106016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ios+games+download+apkPDF 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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 10572 bytes
SHA-256: 9a6742eb3244d153fa1f576fa7d33e197794233120f129ba2e3004e138f328b4
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 17148 bytes
SHA-256: fccf8e75dbe577a009588ac884b044c0c2ed87ccdfce87e33f676799e679a43a