Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa383d152cda951…

MALICIOUS

PDF

156.1 KB Created: 2021-08-18 06:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c25fb763b54a89b4633ba9aa03cc5f6 SHA-1: 8d1ede5ca2997f54592f142b868e4fec681cf345 SHA-256: 8aa383d152cda951730f65beead88d4a9a49a4eccdcd9288f81290d12dad9717
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://muntepa.com/userfiles/files/kibenuki.pdf In PDF document text
    • http://homeopathyhk.com/files/movutuwiruwofexuji.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/1077191565.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3b82e02087104b8f71a30c7a8c77de40/titemeg.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/lepadovatofa.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/xorogusanaxubunezokokug.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/nec2fa2gbd7qq68319tbv0e6kf/riromogode.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607562c4616de---54894868198.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2ugc1cnnob4dcrat47c0hrk6e7/32835368433.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609744601abe5---22107615837.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/494dab153988903997241780ef17ecde/57905525443.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/781dde33a887e9f66fa4827e56b582e7/7462319790.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/bozazisufugasanezo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/losanunabalirijegipilexed.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161082a5298ce1---82262401402.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210806192807446.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1e76a0a8897d6f2e32f03bee1ec0037b/wuzoluzeniloj.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/vupiz.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/jaxoturirobudigiz.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/67744418156.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b8189f28---nixelumejatiravije.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/75118309551.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/bumuxakugapovupela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ca+report+meansPDF 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_off0002034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2034D 18144 bytes
SHA-256: 92277f71d1838dd4a498be5facba1d961a87f0c29e2bdf85ce99bf5e5a9ccfcc
font_01_sfnt_off0002314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2314C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24963 10308 bytes
SHA-256: 7e0d61bd67416ae67626330af9a9d000a32d82c0daa0e99c4281dd8450bbc299

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