Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1c0c63cbe998fe…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 00:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ac5e2563ba91cec82f10d564e4763da SHA-1: 3521daf6159e247f27b770a5ba3be791f7e48f35 SHA-256: ae1c0c63cbe998fe396400f113c748a4ae07c7d9a908a6426a79f288ff65db0e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to potentially malicious content, including a link farm on disposable hosting. Heuristics indicate both an advance-fee scam lure and a lure for browser extension/update installation, suggesting a social engineering attack. The embedded JavaScript likely facilitates the execution of malicious code or redirection to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nhatrangpalacehotel.com/app/webroot/upload/files/34985986513.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/vopudexi.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/menojivareladepobavokes.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6ee0eb233ca696f9fa7967a0772adc94/fetuzaxenumuw.pdf
    • http://hongdanhaudio.com/luutru/files/nejasexikila.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/18911746902.pdf
    • http://cbgnfinance.com/userfiles/file/tavul.pdf
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/65552185497.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/jazomitesupabojo.pdf
    • http://caycanhtuyhien.com/uploads/image/files/jakux.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f847c1e999---talozebiwabekikunogekorib.pdf
    • http://alothongtin.com/upload/FCK/file/67686107278.pdf
    • http://mcserpenti.com/userfiles/file/85098418639.pdf
    • http://karimeh.com/public/userfiles/file/junevevatuleburota.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305976b92f2---98685396572.pdf
    • http://formel1vermietung.de/userfiles/file/xevupezewumibatenido.pdf
    • https://kingcarmotorista.net/uploads/files/tijukezuzozulipebesosa.pdf
    • http://gesundezellen.de/neu/userfiles/file/26526881188.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/80130946788.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3317047d66c49b3bb58c5c719f2634c5/nenikupilulasuzafozem.pdf
    • https://vannordenvastgoed.nl/userfiles/file/42173618606.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613057e02db3f---64995207454.pdf
    • http://mini-garden.ru/userfiles/file/bodupab.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lm203b44m7a5sjj1r89rgte955/47617213199.pdf
    • http://klinok-saintp.ru/files/20521823951.pdf
    • http://skrn.cz/pic/file/vilazoza.pdf
    • http://dietmoiquangle.com/webroot/img/files/23369455398.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+7+chrome
    • 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_off0000f790.bin
d09f2a6b5d71a98802f47e7d918521ba2dcd0bfe5b8bb2b0c6449e7872dc93f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10192 bytes
font_01_sfnt_off00010e2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 16792 bytes
font_02_sfnt_off00012640.bin
73f891a324e03b3aede75e3c8600e778f80e309fd000b4026224348f98a41da5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 17960 bytes