Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb73e9d59f7f6b1…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 13:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d10ba2a37b07545eb75da80c351e0c71 SHA-1: 7d5a1f4e17a613faa004688257ae629dd09b1ab0 SHA-256: 0bb73e9d59f7f6b13779532a3bb4d137b667499f7adebba15ae07b7869fd9947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the nature of the hosting indicate an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=installing+metal+roofing+directly+on+plywood PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611f009bbba73---fevugawubarigo.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/48111009751.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20679748321.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a825138ef44---21811506300.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/galamatapixafitabijulijov.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/ledorufulaterovefumedat.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2a9d7cbf60773b6c57b82f1c57c6c908/zaranilixazoti.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/suduwexumodevij.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/14452003997.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/10203579361.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/jalimisabewefixa.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/jomis.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/26149101444.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fisvq8itgegralakpaco8mf2gc/jetabijefen.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bb1baa2800ad9b5a096a0b86051f9b0e/7271990825.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4887afba3179bd98472d6641322f640e/gobekipuwugig.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d052267ff3f---majunamumafuvamuzagik.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b683714e649---36522294020.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a358ec0195a9cb665d25e20629310549/xumawekijapubixe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4lcu842d2tc1qjhnirq8o8oo0j/27093260224.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/48071051142.pdfIn PDF document text
    • http://www.bash.cl/media/file/62351688163.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_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 11116 bytes
SHA-256: 999ecce6e6869871276eeb740d1dd04a2e74010ada53192b5fe418e455642485
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 18424 bytes
SHA-256: 09461cce6834910029bbf7845346d093740e65f81abadd7de52a53e840860a73

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