Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0d91ef9b864220…

MALICIOUS

PDF

95.4 KB Created: 2021-08-07 00:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80e04c3f52b5b225216bc48052140f8f SHA-1: 5c52e79faa22b41f6820f78ac20973f2362152be SHA-256: ec0d91ef9b86422016ca399bef135151a898f463587ae7cbccf418f281b44a2a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://rajatotogroup1.com/contents//files/29919940731.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6df979a2---jitosonupuvafi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa58a1d9d74---widukilipumabevonob.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/26347949563.pdfIn PDF document text
    • https://angkagenap.com/contents//files/sogofowes.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984573dd243---99524794513.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/bajuditopamepoki.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8572c3c4---90968378822.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160efe0accb73d---balulumuk.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/69133323467.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/86068056992.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/35383311042.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608439394321b---zipiruna.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/efd8de7094727940984c400c64c0bac6/nazexamamawuzaxux.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nemefegifolu.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/63765407110.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/lewufulolumazedan.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4875a40ac8---92530001658.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45238eb36d---rixinulef.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/25774139848.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/dukadaruwiwu.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/58763184406.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/33126822583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=employment+pass+application+formPDF 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_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10736 bytes
SHA-256: 957d2cdd2328d6e5c98c13ed217bd233e638110f1d6499452df1a940c7320dc1
font_01_sfnt_off000128cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 17988 bytes
SHA-256: 4e34a29bfad8cd2d4a29346ff33f6377130bed2d3817a0b1126098c5f2e11983
font_02_sfnt_off00015868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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