Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c33bdb3916f2202…

MALICIOUS

PDF

110.4 KB Created: 2021-07-02 06:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1e57ec2de6cae819a692a0bff17ca4ba SHA-1: 0615b950c1923ff3e7b0cd495085eaffe4156f3b SHA-256: 3c33bdb3916f22029516b901294358b5bafc293e7fd7cf4f08115e11a60f25e1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, likely designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics suggest it may exploit PDF vulnerabilities or employ social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=holistic+health+practitioner+near+me PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6be7bd096---pikasizobufivurer.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c78c97748d1---45912803259.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zarizofokalipasaximugajaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b46ab4a2---42480294834.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dedcf5cc42e13219062b663758d30ce/najomujaxibikidesase.pdfIn PDF document text
    • https://discoverthesky.it/file/wabavozitawugodalesason.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770488928eb---daxanokukokek.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/7669896243.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/11528522335.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f78cf3cf32f5256b90deabfba4a2061d/908912571.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/fexulapemiwajojekukelep.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68aae80706---nivuxigaf.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160843f16a4e5f---gipemavar.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3588052b17---zovovefumeferoxuzeb.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f1a3906ca7a664b67d7a28ebe68089/doneguvamodetekijuvasoxep.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/livelekelekiv.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ervs44j8gbkio2cc91ot4ko934/gaxalitesewufidinedezotu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2fd30256---kasikijupibopituzatetux.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/laniwuwojijij.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/kosobabedu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0941fec8f1---11826571756.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/36aec4d9cbc2be3e44753f5dabe0d69d/sevowigonipinadivu.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_off00014fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD9 10632 bytes
SHA-256: ce703cacffe0f7a6c21fd6e7fed24a2c86aa1d6e7fe122c9defade833696177e
font_01_sfnt_off000167ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EF 17112 bytes
SHA-256: 2a237d514bc946550ae3f7f6cdd5b18f1fab6809ac77bded087ecc96d6620a44
font_02_sfnt_off00019480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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