Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64c8e54a8a47093…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 00:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9607112a413924e2b75359bc5fb28159 SHA-1: d1172d7c8e94968b5fc2428c3dc828afc5b7b063 SHA-256: c64c8e54a8a4709315f1f64da9cbbe1c65698f9f46fab898cbf0f610e093cb6a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and potentially distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allineers.netlovestories.com/upload/files/74959255211.pdf In PDF document text
    • http://prplus4u.com/ckupload/files/70560364342.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/36044388978.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ba13f8097d48a55b0c7b8e50e65240f3/bekisawinowagavaxeroraw.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/74685228403.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/genibabemu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcbeaec82f---bobasejusipuduxataler.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/189768898.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/84210450244.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/31274475739.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006e335643---boropizek.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a57f1764e730c824737df7a21b8e0cce/wigemijozobafewix.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/46445053663.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/34709960976.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/nosupapavejazakerofoxad.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/14954140878.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/98350998131.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/73040250957.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/kixosuxigokamarekizeked.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/21031779387.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/kisizolituvotaza.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/aa4a2c3861aa6a3fb35d89ff51007feb/61648319254.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/saronekifutogudege.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/riwipodunulexevufinipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=plague+inc+apk+hackPDF 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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 17592 bytes
SHA-256: c7d044149b7acf34e1954679e7fee5afb2bfa6e3ade0f69e6a2e06c8f4a49c8d
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 10360 bytes
SHA-256: 802f2fc7e9ebbd678f5aec7fdd45a1ecd53efa15b053af257db7013002ee9bc7