Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d783f705cc4932f…

MALICIOUS

PDF

85.1 KB Created: 2021-08-11 11:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4a9cd5b52f6a7201d5caf427f97dae7 SHA-1: fc124e157efce8a8f847ce2c1af3ddeda41bef79 SHA-256: 0d783f705cc4932fdb239753ba5a47e685fdcdf89904846dede8f3aed8734e72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malware or conduct phishing through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=sap+crystal+reports+2016+sp8+product+key PDF link annotation
    • http://architects-desk.com/uploadsfile/wujasizonuw.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/25380650253.pdfIn PDF document text
    • https://papiratisk.cz/soubory/69913380458.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b48e816491a255440e56d096f809e176/karazuxokaji.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/sikagogozifajed.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/zutaxukipafaxesiwer.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/66c3c3eedc66632e02cf8b38b72398e2/rivutekeve.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/62796670928.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb06b745c---logezeva.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/62f21b4d195ec9ab36657ffd5e7f1729/laparelikixetejiraz.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f2702b34f12bf6e6a9d5851144428845/ranaxejufufawifasarojif.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a95a27b1d703a50c47ca13e3753b3a08/nekakumilut.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n4f316hg4rgt9k8mvqr30bs0m6/firalusetilozulibiramip.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/95871950303.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/mewefosej.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061516435994.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609584117ac5f---79482605827.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47278876820.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/12444551047.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/wedaj.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7a5102add3457e47fa111679dc64ed12/tovolimetajelexemapox.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8tgeh8oa18r1fpd85mk9istjtc/37115977313.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/441675245a78a4254052cfca8c8e7781/xewagowog.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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 18328 bytes
SHA-256: 3cf62dcb82717db3c57046d14e7ababeab101b691420cdb774dc0c22631cc03b
font_01_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 11360 bytes
SHA-256: 39c9fe4ad35eeca662a0c5f92312b0256f6450394481031936fd1b95d9db102f

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