Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47f729e344003eb…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 00:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0f3ba681a21b9700c53b77db083e5c8 SHA-1: 7c3f6fb65837a6655f0136093860ec299d5a50cd SHA-256: c47f729e344003ebeae8243369552f6ea4c9e4d0bcfd86b7e889fbfc5818d78d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only facade designed to trick users into clicking embedded links, which are part of a link farm hosted on compromised or disposable domains. The primary purpose appears to be directing users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=reload+all+tabs+chrome+android PDF link annotation
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/25907759087.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/ragefofifomu.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/wuvixafijudopujotavikuf.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/xikusox.pdfIn PDF document text
    • https://objednavky.dortovapohotovost.cz/obrazky/files/92536594139.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/71048707856.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/58345547272.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/8779336542.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5e0299552443f744e5b468e24589e6c1/lileto.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/190506468.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/vobaxurexusikofasowibum.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/71069323129.pdfIn PDF document text
    • http://wdnederland.nl/file/japejigexisojaduritogizel.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/78773692821.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/7585007177.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5ec5e1f---xilaworiva.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/nesoruzuxurokupeduxime.pdfIn PDF document text
    • http://bushurov.ru/images/files/18660680222.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/82873621369.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/23350828332.pdfIn PDF document text
    • http://timebymtm.com/upload/files/ginenimajopezaluj.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/tujijowalixutuvazo.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/85257587135.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a3919d99d545f2cc6aebbd927ae71318/jufopuxopa.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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 10820 bytes
SHA-256: ad5acb3487cd8a97257c9dd04184d4d146e3a138e8a97b5304bf1e9b31b01c47
font_01_sfnt_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 13944 bytes
SHA-256: b6c15d3cc64a6719b96233d5e888bf4bf7a36e025c9f75c338a8a6f6213930a7
font_02_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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