Malicious PDF — malware analysis report

Static analysis result for SHA-256 575fde1895dadbfe…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 13:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 069e99020a48e8698acc92ead5bcae5a SHA-1: e92cd8752f82a5948a667e5abae16dbe9642d0da SHA-256: 575fde1895dadbfecd82035c54b367e85be9851184a0b2ccc628567fe75b133d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a lure for phishing or malware downloads. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=the+day+after+tomorrow+streaming+free PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb478b33fa---lotuzuziwupalop.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/kurakobafowewage.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/78480905638.pdfIn PDF document text
    • http://orthopediedelft.eu/files/24634342574.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/kefajogovivozufitow.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/xukiwedoviri.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/51e4afcb0736d135dfd00ad6fe2d724b/30828320703.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/36732453192.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/4286373309.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/wugab.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/rajimuwerupenirozirol.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/mebasofazixewekasomanu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/uo3rh1vetstojtdcj3t66ehfkg/lenorupewe.pdfIn PDF document text
    • https://tch.lu/files/files/55083776408.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/jomoxedekovikadexapaxe.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/mixevozavalixoda.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306dfdb94ae---42547477704.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/18109025944.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/nelixojidugekodesepudi.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/35041402727.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/vekawofeloxokimugodirot.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/39423589147.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/41506779036.pdfIn PDF document text
    • http://mfcpavpos.ru/file/59818033457.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_off0000bd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 10920 bytes
SHA-256: 20e8afaf401de7d7ca92554029926bb644d99ace4e7eeb27524ff9dce1e6bb86
font_02_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16996 bytes
SHA-256: 120f42c440faf7af9b9d178f8b88b98d2e3dabbf45d42d34bee993a705cd9e29

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