Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ed2898d3270782…

MALICIOUS

PDF

74.0 KB Created: 2021-09-25 20:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 293c7548cd995ec4bdcd23d57e6ab928 SHA-1: 40aaf5485cbb8a052df1cf7601f3f230c6b2d6d7 SHA-256: b0ed2898d32707829b444f142b1861e09014f5ad1668176944febd9061e2dc90
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of many external links and the heuristic firings point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://agatanorek.com/files/file/puwuvirovovob.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/kefab.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/litusigexakavinunobimupip.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/bevosidoporuvagedider.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16318728818312.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/perawodaxodixu.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/49136562596.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/59188246821.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5906004dc85ac7c9d7a129e98337f285/jadovutegatofaxezuj.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/470782926.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210912102112145.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/roselajojipusonabiwuval.pdfIn PDF document text
    • http://osayit.com/images/file/53162778675.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a01d4f65057c37e6081aa84d68b313f7/51936403012.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6ed8dcd6---9215138571.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ano90s0f9qt194gmq3qq4f1uht/73124799507.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/suwowaraled.pdfIn PDF document text
    • http://alvitraders.com/files/4115391456.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/6358173220.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210912215655.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/84325916226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+c+programming+language+dennis+ritchie+pdfPDF 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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 11132 bytes
SHA-256: 8ec93cf1e02e88a25efc8017b7a0217a1d4a11c582a034413348931cf62d131b
font_01_sfnt_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 19852 bytes
SHA-256: 9c3546a2a7738cf1e13cb56586fc6d2a5d0542f340c95219677ee0211c87a756
font_02_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1