Malicious PDF — malware analysis report

Static analysis result for SHA-256 709701b6e67b3471…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 03:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 903db6358404ae7b7b9c187396e4fe3c SHA-1: 7ea4f36dd05d736cf9758acb2b1cab721a1b6783 SHA-256: 709701b6e67b3471fbd388efef9f2db8d5f4095ae95b51e8e9d941edd7630cef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised domains, suggesting an attempt to redirect users to malicious or phishing content. The presence of embedded JavaScript indicates a potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://argyleliquidations.com/userfiles/files/rinoful.pdf In PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zadeposetofodim.pdfIn PDF document text
    • http://offerparts.com/upload/files/57543560439.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/35554252906.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/87253492812.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d346a1903---62696235973.pdfIn PDF document text
    • https://media-get.com/userfiles/files/48766574170.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/nidoz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9a9a6a3c4---weniwize.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/bizatejom.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913203435792764.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jubamiwosidinabefeloga.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekisumotenabapakuluw.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/1455378454.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/nekuvejutoraki.pdfIn PDF document text
    • http://poliinc.com/upload/files/xowepoximogogon.pdfIn PDF document text
    • http://grimastone.ru/files/94692384446.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/muzusipabepetalifuven.pdfIn PDF document text
    • https://e-room.co/userfiles/file/desixavepuluri.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d184008f581f33306f8e23c2a745e01c/22265413565.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/rimajapujoji.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/taxabanevavuzimebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+apk+dotcomPDF 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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 10652 bytes
SHA-256: 312df913297b0b01ba86c6fbdebaed46885a77cfbef6ece1d14b0fc208dc1596
font_02_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 16168 bytes
SHA-256: ff476b837102ad3bfe195d24c1a149705c69e7ba61f2a4ac8f9ec3ea09fd0d00