Malicious PDF — malware analysis report

Static analysis result for SHA-256 d067e32b762b116f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-24 08:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3104af059ae28c65c127a2e415e26817 SHA-1: 72250a5d009f07b82631309771c9dbd89f0147c1 SHA-256: d067e32b762b116fd296ed272e9771585fd28942dd30dfd10d72589803da05d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms on disposable hosting or compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://crewmak.ru/uplcv?utm_term=chroot+kali+linux PDF link annotation
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/xexuboxebesapoligapejiput.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/14479258231.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/kasaxefewoxinenufeluwa.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/fitenomopovamas.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e994a649---11806287631.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210913031244_1345254286.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/89301511535.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jetopoporamemede.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/30331596312.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gadimu.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/tuzegajizininujun.pdfIn PDF document text
    • https://tigaintan.com/contents/files/nakirusugaw.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135492adf49a---13209521226.pdfIn PDF document text
    • http://kco.su/userfiles/file/17927302883.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/9253245913.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/17105577474.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/3382475737.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/kawepazuju.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/49558427035.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/lidimapugunagiresezele.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/54302497777.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161424c56d774e---juzatofidavipepe.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614824626f0b9---feninifizowuselinubib.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf923800eb---solat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4B 10232 bytes
SHA-256: 915c72fb54e9fcd67fc127ae923b8687deace5779a2aeb58d0cdf2c8f2fcd571
font_01_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16584 bytes
SHA-256: 3ffe9921e18f9a238196040ec6592829feed49f8efb4295210479ccbb37108b1
font_02_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 19920 bytes
SHA-256: c0815b8725f277ac7452a9f0d7a39fe93baeacc23ef8a9dc36f2364ab8dfc259
font_03_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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