Malicious PDF — malware analysis report

Static analysis result for SHA-256 945473ec77ee317b…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 13:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb3e67c0477a4e6bd869527af75e7e69 SHA-1: d8f1b49b103020ebe341c0bd7e847c8136769118 SHA-256: 945473ec77ee317bfd1fee116bfa2d11bc35ed75c2428366e3ee185acb252bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://talani.nl/userfiles/image/file/nesokawezufazinotiduf.pdf
    • http://vom-ragnaroek.de/uploads/file/74060389405.pdf
    • https://aqua2go.pl/galeria/file/napajiba.pdf
    • http://jadever.vn/Images_upload/files/60215029486.pdf
    • https://weyergans-hcc.lv/userfiles/file/movuvixigekefewugisovew.pdf
    • https://aulacvn.com/upload/fck/file/zoludojamosunadofovosoko.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/64dedacebc8f3c174eae81f57267adfe/soxamiwurulotexolurew.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wutoga.pdf
    • http://www.hussco-steel.com/husscofiles/files/54788995486.pdf
    • http://beachfirebrands.com/userfiles/file/13748138975.pdf
    • http://guowangcable.com/d/files/ganozafobafes.pdf
    • http://ehomeforeclosure.org/images/file/dunobelofikur.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985d0bd230f---jetagamexakenebigaliz.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16075327ae95a4---varotuzirulijixulitam.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4d09adc25be15ce278a9918c5284a395/fonavutefadubulunawisid.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d7311b69---68652174938.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kugabafojanifonijuxug.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b7372ac09451145abc200ee19692c8f6/lonalabeterebumos.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/24485253070.pdf
    • https://winstar-tools.com/UserFiles/editor/file/65681665320.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/88159991589.pdf
    • http://exdebt.bg/userfiles/file/tavoradikufokajo.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5q2uh48huvbk8gq83mqm1c51ul/xamajax.pdf
    • http://wonderpanel.com/app/webroot/img/file/lusilixaru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=advanced+linear+algebra+lecture+notes+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 16792 bytes
font_01_sfnt_off0000e0c0.bin
64b44e69a6d87c5f132a55752c979afeb0e50de6fa5128f64f689c915a97c5f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 16800 bytes
font_02_sfnt_off00010c09.bin
c2e1115b5d5b0ac09f00a63f17a8d51445fbb5f6bbb4810763939a32faee32c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 11084 bytes