Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b40fb6c464e2b2…

MALICIOUS

PDF

84.7 KB Created: 2021-07-13 19:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c92ce517065f80d739924bd9543f0a9b SHA-1: 0225234fb52cdc1e410a92467545715ca008875d SHA-256: 73b40fb6c464e2b28c42717359525c75a7fb9df489732faaa49ed236b85c5c64
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or lead users to phishing sites. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters further support its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://righetti-ticozzi.it/userfiles/files/93794385855.pdf In PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f87561626---puluzejaxowefefuli.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/u7ud43hrofh6rqn8at16amlmpg/7750680520.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/debajenajoxevononizufoxub.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772fe3ebfd0---21370850971.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zujuxirupikirovinaxikinot.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/fifibinavitene.pdfIn PDF document text
    • http://bjjiffy.com/upload/57261724237.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11e1b328d---nunus.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e268bed9c8cf8ba122e8cea5de78f854/3052612587.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931938df6c7---22073301242.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/mutike.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vutevuwitajug.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702df53c0de---68885484655.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6fd45e4389253f4dc07c53a6c53052b0/95283341410.pdfIn PDF document text
    • http://autovoda.ru/upload/files/82771844571.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xotut.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/2092771760.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/93217230202.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/32794963202.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/67374756971.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/pubulunaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bollywood+and+gossipPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 1852 bytes
SHA-256: 7894ce70b85315a6af0017eff107d8db111df3da1f2c3411a3d74d8820d3fe9c
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16968 bytes
SHA-256: 97a72dc53c4c2ae00a3c5b29685f846803b0cac2fbc1d0915528b8d6ea0eb240
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 10492 bytes
SHA-256: c517a23aa7c5e19367ad0842a94db75c413fdc4ad529e27ce6ef69578c12668f

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