Malicious PDF — malware analysis report

Static analysis result for SHA-256 4136c2e13d469cc7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 00:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a6c6ed4b77233e600ac0dcb52282986 SHA-1: 2ea2f48d221adacb35aa4b7847080e5bdb50d0ca SHA-256: 4136c2e13d469cc7d5d86dd2b5447f33cfbe2dd60df3f4e1a6157eb7d8342a32
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pinpointfeedtech.com/ckfinder/userfiles/files/13916892663.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/24d60bbf2dfe32823f7f7c37753ea48b/nepifugonapekoduvuk.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/gulosiw.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/32826880255.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5o80kr2hilrctqt5upm30t5t95/55749900584.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/30947194391.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a337a6c47---webobotadugokixubupa.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072040105134---teguziduwabutegezevor.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120421c4ff5e---4454723645.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157c6d701ac---suxefasofuje.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161073feabfcc6---lewuborebimifodemoj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b758392c3---zikexeti.pdfIn PDF document text
    • http://519pf.com/userfiles/files/ruvadawifegofup.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/55191961792.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/27159441202.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/falexokolax.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/zufokamuk.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/89772906202.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/tefigebunutexorakibuvit.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/10670269557.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/xezal.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9dabe9b586c297d7efb2a6873924173c/kexazojowunujujuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=beowulf+as+an+epic+heroPDF 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_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 19224 bytes
SHA-256: 2f91d2693ec3b87ef4b27843124f9e18fc4ee795fbe69d78795866b591fcaced
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 10716 bytes
SHA-256: 36ad963cee5b02ef4fcc5e213052797b154ededab188e9533f5f2ea3e1673b86