Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca985450e2a176d5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 13:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3367ea0687752e8be9d77775c419028e SHA-1: d6ec9115a72afa7bcfaf65033522d2f1b389ee9b SHA-256: ca985450e2a176d59a4a51f0be5ffd4dd4b65286e3d31db67e111ed89b252470
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of malicious payloads, while the link farm serves as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=q+words+without+the+letter+u PDF link annotation
    • http://xnucleus.com/members/member_images/files/dulebosadasotejuges.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/goxelali.pdfIn PDF document text
    • http://manenshop.com/upload/files/rexakiwomusukelaparif.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc60a5488---19134670905.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/jepezixawuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e3e7240b---tepuwepowikusipivisumo.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/mizakas.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161432a6d2358b---dutapataretuzufejiv.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/45194019199.pdfIn PDF document text
    • http://na3.it/misc/file/75403094437.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/31996416409.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/57942909903.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138940d46f21---nikofegobiwemugosebob.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/10509694092.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/52320606731.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/29486066011.pdfIn PDF document text
    • https://t2sc.me/userfiles/gogikugiwuwabejepute.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/fumanoxusamekud.pdfIn PDF document text
    • http://herve-coiffure.ci/files/29980877745.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/fkgr1na2bn675e92q6p4lnl0lq/50614236900.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/94413286804.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/66578437448.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_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 19188 bytes
SHA-256: 9f04bbf97d7510f48a730c1279653abf1fcd68b93bf9af369f1e853518e3fdb7
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10324 bytes
SHA-256: 26637d18525f1006a72dc05c5557bc36215fffc3e66943c076794c75e222ef73
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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