Malicious PDF — malware analysis report

Static analysis result for SHA-256 867b58ed2c960660…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 03:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9f14083bfd2a89892fa7108ebd156ad SHA-1: 221c3d65a89873a9f49245c7ceae46cdbbbab014 SHA-256: 867b58ed2c960660a040be19854726eb5cb3134084e9627661f948d623ffc4e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on compromised websites and potentially disposable domains. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://cnsgafgl.netsociality.com/upload/files/44208751898.pdf In PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38286886414.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/xuxusofuganapaduvitu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a08cf2f5f---tabaxenagunexed.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16137838719188---2793400150.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/33162813324.pdfIn PDF document text
    • https://dm288.rs/slicice/file/foxexuxab.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345518eac48---88223742995.pdfIn PDF document text
    • http://vit-physio.de/file/80084356448.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/qec0s7hvioqboq9t1rn4k35i5k/lijemawirono.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e09877d34858db342373b8eea55fa1d9/20737884553.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/buluzaraxabinikifisezizex.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e51a55d6---zutere.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/jadaneturariburotub.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/pujumebukorexeme.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/limofuxavozibe.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/nakemivugarifip.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/41502405173.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cfc7b119bddcf99303ed656d48b2fa8f/gozaxusidejud.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/kelorasumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+best+gun+in+fortnitePDF 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_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 10488 bytes
SHA-256: 3a7e5fc25f3316405924b6adf29ea30a49b2a9aaf9703f0bd2d3ce52c2858f81
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 18220 bytes
SHA-256: dad3851edbcf590688f3c2b685e1f276321a626e49649aa43a3155a2a46c5ad3
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1