Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85787df00542eab…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 10:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f24ad8c6973fc7be52ed557a93b6216f SHA-1: d97b1268d43ccad4e47951c9f00351d3a790f8a2 SHA-256: b85787df00542eabba9abd8c42f2d5653f5e0f60c835235c39c55d1eaff480b7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or link-farming campaign. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=top+5+best+mobile+games PDF link annotation
    • http://navigator-nsk.ru/userfiles/file/14200312441.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/9952545443.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/bogojonuxixukuxozasazovag.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/86265404200.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/51835576560.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84291888281.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/bewipizezezogejojasado.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/57210952857.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/20395709211.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/goximos.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/53141939275.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210901210939.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/6204661152.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/83429203174.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98403c603---91447160702.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac4c05c84---mojuvufinajasol.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/90795342881.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/96646465175.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffa3d0b94---69510651627.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/9051497278.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/73839861772.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/mipoxilefifuf.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109070427362747.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/sewebakozufuvazeke.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/50730901754.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_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 10628 bytes
SHA-256: 8c8c918e3a3add6eb1e332263c0151e258a05220df74b18f9d94895137906fb5
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 17784 bytes
SHA-256: f5d3d84d76e2971b78ba99760c58fb2cdbbb4d8ea754d208e09d536c87cdb571
font_02_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1