Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab92c38a2208503…

MALICIOUS

PDF

99.8 KB Created: 2021-09-01 06:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6af24513af10d300a1f81aef0dfa351 SHA-1: 7ddf0b9645ed8742062f7e01dd26bb75fc2cc05b SHA-256: cab92c38a220850389213fe7e9e2f13d1456da639f163e1a10c601b6451b26e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://agcslohian.com/userfiles/file/lujazisasiwog.pdf In PDF document text
    • http://drtamerturan.com/file/15987922549.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0735b34d---dabudaworifezoviru.pdfIn PDF document text
    • http://shahgrp.com/uploads/gitulotetari.pdfIn PDF document text
    • http://hzqzg.com/d/files/newawamadorolisaxe.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210812171758.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/89fdd0340d1bdfab9d4d442859d34880/gajuk.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f5639e5b25793c759935b9c9a32838f7/mofovimekosamikogiribu.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/91988541162.pdfIn PDF document text
    • https://magatek.com/documents/file/dumivolos.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f39c22ab---suwun.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/23853325279.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/32561394627.pdfIn PDF document text
    • http://letdentalab.com/img/files/sasepuketosevazadotopot.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/72898742126.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39328122623.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfb749e84---xedate.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0123b93e5f---63729276720.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/75222162901.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/xivuvabafev.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/7127585435.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607886f077702---bozufaragitiduzijobepo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb00c324b---somovapuponifoki.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/dizegobid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cone+and+sphere+volumePDF 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_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 21388 bytes
SHA-256: 52e097f032caaa41f314dd4a76541c3d71cc3db2acb02d4960550da986303ffd
font_01_sfnt_off00015084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15084 10664 bytes
SHA-256: 15703775fe335e10123ef01d46f383f56de865b192cf04f428ebf6771620a5a2
font_02_sfnt_off000168c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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