Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cd6c75cc2871c3…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 16:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d01179e7ef6eb1a762f81f1a6723962f SHA-1: d64dc57aef9236cf04d48dca0c46eddd14d48e69 SHA-256: 89cd6c75cc2871c3cf0ee399a7d2d790b2b54272506ba240357c890babab8cd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=delfin+arbeitsbuch+teil+1+pdf PDF link annotation
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/vetewujofodo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jq9vor04ektrr5qmunj2qrg30g/9375484837.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9imp1mmsnbir6vhq45jokcilvd/gekefowam.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/90809600379.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/zusuzuwedu.pdfIn PDF document text
    • https://loctra.net/userfiles/file/2374154144.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/732e7be14cee7f91c3091d39534ded6f/15101238630.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/34502991441.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3ac2727c8e95a69874f2a371bfead90e/pamevug.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/ruwamoxipegubimerebov.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/wubedovolokimovula.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee25ca332---77463852776.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/joresikapamirorup.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/16624418827.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/bakesuwimuliratan.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/jofebomafefufojixer.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/82413469419.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zixozu.pdfIn PDF document text
    • http://huimao.com/upload/pegipapogovojugozube.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/38110530179.pdfIn PDF document text
    • https://preciseenergygroup.com/media/tezez.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051404073773499.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/40113983825.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/19229845835.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/guvezagipidi.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_off0000bf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 10888 bytes
SHA-256: c6ebd2f9b6cef0e7a7a590ba3c9178e6c6b5e493de1a4a2e42de95cbf7b626c5
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 21292 bytes
SHA-256: 640ba8393dbea458e62ddd7462e77c19fc66e0c04ee83f0d7a7173d3ceaa33af