Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce59b9264e5201af…

MALICIOUS

PDF

92.6 KB Created: 2021-07-19 11:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 01e68df411573aa2d374cbb3452fd3ab SHA-1: 99790cf4fc8d4e858cb7ae792f443373014af544 SHA-256: ce59b9264e5201aff09aaf316955036899a3824df240bfa69b57355656168709
204 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document employs social engineering tactics, presenting a fake download button and a lure for a browser update to trick users into downloading a payload. Several URLs point to compromised or disposable hosting, suggesting an attempt to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dangkykinhdoanhkiengiang.com/upload/ck/files/35001931390.pdf In PDF document text
    • https://oddluzanie.net/userfiles/file/nanirunenosa.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/28605863558.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/55269570840.pdfIn PDF document text
    • https://chptravel.ir/data/file/73870685519.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/53849842389.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/jarakem.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160927a50a3065---xexax.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/08be6cb89b3760765ad223133ccfb330/6335503933.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/cstcqqmer11vbsjdblaltr24rc/lagatugenunatotozetibot.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dozaxinodapalusepavunadox.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/36039659268.pdfIn PDF document text
    • https://sbufficio.it/file/296823747.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/jaupqr84hlgepoo6322204tfn2/46689213793.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ual1ul8g79bat666q56t0m2dct/98898022151.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab314959cb---mamafuvefujevati.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44dc412eff---kuwepaporudopipeto.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/20fab0e4ded238bfd9f1098b92b7e823/37420374088.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fuxadesagoserizi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f3bd437b---48099038800.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/lepojupo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58ab501b3---42802569583.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/353f3ce26fdaa3bfcae6393b1cf77c08/remapumagevukotejomaxif.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/gusitububaname.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca48d55080---lofopipuxaluvivavulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=five+feet+apart+full+movie+with+english+subtitles+downloadPDF 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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 11316 bytes
SHA-256: 14e211e3c6820c1ec27e66e22930a7705f1360f36931136eb4fdfadcd41697a8
font_01_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 17736 bytes
SHA-256: 8c1a9c2260af2a6724a94ff7cf4e8e1cd3a0b331ba4c2e4b64dbafc5d8b448ce
font_02_sfnt_off00014c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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