Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd3e9027b82e91b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 06:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae4b1f2d9af550401b7f3e968f13fc44 SHA-1: 9623af77aa24b0882e162aae1d8558ea77bb962c SHA-256: cbd3e9027b82e91bc9bdf075b9bd65da83d831bca356c2008971cc09c9176df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77f1ef74---vegizurigakigumikujusobal.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 http://dkmmotor.com/files/userfiles/file/24952114007.pdf In PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/45639394300.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/72875768981.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/zajoven.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/wonifilelasisusakobubo.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77f1ef74---vegizurigakigumikujusobal.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/89574229005.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/bunodutezi.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/28810078503.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/belim.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109120611393518.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd695e9a72---vosetofopiwebowolesak.pdfIn PDF document text
    • http://infracsap.hu/files/file/damun.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16131b83199aec---12881674743.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/10106479106.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3j4u6c2j7k1ta4hhvufavpqjh0/3723665885.pdfIn PDF document text
    • http://generaldistco.com/images/file/redowiguzopazot.pdfIn PDF document text
    • https://braus.uz/images/shared/file/37662073643.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109020232201366575tdkix.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/selinuluxetetojepu.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/46489966861.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/14354914339.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/59208751746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lucky+dozer+coin+pusher+2020+mod+apkPDF link annotation
    • 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_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 19000 bytes
SHA-256: 0c2f08360202eca4db536798023522ef7f30b37a064a02a0f4fff89b9d63c330
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 11200 bytes
SHA-256: c23f2f5884e5458453327b6ce803485546ab7f1d2210b4b9c53b574d12326bda

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