Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7d61c243b82f08…

MALICIOUS

PDF

71.3 KB Created: 2021-10-04 04:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 31680c153eca74d997a9de9ec9b739f2 SHA-1: 6c6b370cf2b434b057cd8a9720b281d426f3a082 SHA-256: 5a7d61c243b82f088da27684539ecdd24749835a42debbd5d99c56a14b5788a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ls-machinery.com/uploadpic/files/202109301911478513.pdf In PDF document text
    • http://studiorumeo.it/userfiles/files/wovinuninarexewukobeda.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/76660558814.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/riputolonosubabi.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/2182418794.pdfIn PDF document text
    • http://marymo.ru/uploads/files/nugogulu.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/xuwefe.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/47966120331.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/b20997f20e1e4bc9126799b471651d82/xibevupe.pdfIn PDF document text
    • https://digireg.it/upload/dinefaj.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/duwedekibuvizol.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/83881989744.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/vojojunex.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/13213189437.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/80143822310.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410f37485e5---42761890637.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/26685234170.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/gonaworekopujorasike.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/nabejazuzudomazetid.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109150111051224.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/28368643658.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/nalipabapeporo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cad33775d---bebirewenevekekejakoxakow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cpa+auditing+and+attestation+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/28571669424.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_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 16472 bytes
SHA-256: 9f12d461311e822d1583aedd16590cffc41a82d57d89356a7abd201e123aead8
font_01_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10656 bytes
SHA-256: 92e893c6d14a3323978cba19ddfa62418418146597839f0f2994b0ea1ffde665

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