Malicious PDF — malware analysis report

Static analysis result for SHA-256 719285110c591f05…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 00:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7144e2f4589bb6e74fa6a00f53ae7bb7 SHA-1: f1321b2371dffbb757b5ad082668cabeb806bc56 SHA-256: 719285110c591f05607812b908128d988ad2493ae3c0f43b0dbe28d786a8fb92
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which are flagged as compromised CMS uploads or disposable hosting. The primary purpose appears to be SEO manipulation or hosting malicious content, rather than direct execution of a payload from within this PDF.

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 http://semihkerpiccilervesupersound.com/upload/file/76685796949.pdf In PDF document text
    • http://servmed.net/userfiles/file/fepewikijisakuninitusir.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/kowumanibogudejifibam.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/pezuturitilexonofasi.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/fojepubomatotomoba.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/fitaximuve.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cc55933a9e8ac8987818354ca135a3e5/xigijotaw.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/lowixonurimixulexobaromu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51e36938e---vojonizowewuv.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce22f057f6---womizinebaxopisigipepazof.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613472d73a7dc---tufividafit.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109050446539326.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xutigajofigunevedagav.pdfIn PDF document text
    • https://highrise.pl/file/59591743969.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/24606195377.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aaff317d---jawojuxogotape.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210907105450.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/gedipimugogovozazedaja.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/98828293911.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6f21b35d---tatudujas.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/14999310074.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75850707524.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/79831612809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+lite+without+vpn+apkPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/pusokubaji.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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 10748 bytes
SHA-256: 6e30f40a7b93c9b72f71dea828c2f0de376188d11995093b8546a65f79156041
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 19784 bytes
SHA-256: 521ffe1898013442ef3692b6fd9a9f7ae99726ba16337ef40e1f5239dc55b505
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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