Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4c3c0099012640…

MALICIOUS

PDF

70.8 KB Created: 2021-09-21 02:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4498c7ab981b017384b69dd5ccf9d94 SHA-1: df58f8003d353a28a882ae8c762f7a3541ed8f43 SHA-256: eb4c3c00990126407af2706b962c5413fb1838a64013a907957162e85ba6d530
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://it-remarketing.pl/app/webroot/media/files/8492738498.pdf In PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/24722858962.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/pibabotuximo.pdfIn PDF document text
    • http://lyshiying.com/d/files/vuzirepirutejunik.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/losodisanirusixosino.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xinipirodepexaxegu.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109072359597980.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace9df32a1---23034247719.pdfIn PDF document text
    • https://tuinvandecruys.be/file/49414044026.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490fe14e3b9---kizumojowit.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/70007413033.pdfIn PDF document text
    • http://risme.vn/files/wofasotavufo.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614916191a9a7---nifojefuboganamuter.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/26871282405.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/ruxevekabumirum.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/25654597990.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/54148481873.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/xokejasokewiwa.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/50686277313.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/gudanipuwekife.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/59210094360.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/95242894107.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/28064030746.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/titamawusoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=orient+led+48+inch+price+in+pakistanPDF 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_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 10896 bytes
SHA-256: a5c47248f2b2fbf22229688f902fb496782d7104e28caa1fb7147a5d621fcbb8
font_01_sfnt_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 15940 bytes
SHA-256: 2716b248dd28999ab8229bbd65f6e032bc586782de398639ab6bac589f9f3bdf
font_02_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1