Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7ea23ffbc26de1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42577bb00b7f758f118c4c52f8715b6b SHA-1: ead539c5465d9c6be638024453caa69d5ac8d2e4 SHA-256: 0e7ea23ffbc26de19daff2d423f6b0b92db66c71a3bdc8f54c8e04c661c4ff24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to lure users to malicious sites, potentially via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ovistar-dz.com/ckfinder/userfiles/files/mexenavazizis.pdf In PDF document text
    • https://living-stone.lu/userfiles/files/21144812478.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6ccba73f---vifovedovanuse.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/wonaneribunilokiporukite.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/xolaleri.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1a2b8de7ee2625ffce7881bedca8b450/49750448890.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/98201767177.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/suwesopixotofipizuw.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35739896237.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/27256842870.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/79761282236.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/80254745377.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/sajosenij.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16149ee4c9d710---pexavur.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/vatibadero.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/pukufezujor.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/80649795528.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97065522542.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/tufikijobubulekiw.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/47935459216.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56095428404.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/26353934876.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/botajebagototi.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/94240591899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=c%2B%2B+data+structures+and+algorithms+wisnu+anggoro+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/jurebewededopakosuse.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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 11284 bytes
SHA-256: 91e3b02f01cfdaab782bd116dc230b9a02a26c76f8478763adf409736059d43e
font_01_sfnt_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 16528 bytes
SHA-256: 6aba802fd5d28c7a2be6d065315a745a3b8c03a6cbe48369729fec7ad7304e72
font_02_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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