Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0741b50463e507f…

MALICIOUS

PDF

91.2 KB Created: 2021-08-06 06:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9767adf38bbfef83f9b1118df5c37747 SHA-1: 9da377761163e46c7b2fd9b26d4cca8507fa14b6 SHA-256: c0741b50463e507f70541a98f3634a0068559ec376488849bc50fbb04fd775f2
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a social engineering lure, instructing the user to install a browser extension or update, a common tactic for credential theft or malware installation. The document also functions as a link farm, pointing to numerous URLs, some hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ph2020.org/FCKeditor/file/75450727194.pdf In PDF document text
    • http://pcccmiennam.com/media/ftp/file/diwufinexebuzo.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/46300731369.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/47448499282.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/60987711934.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/20150634657.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/92051934681.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7de3d263ffc44125edd01580cbed974/ginowitemaf.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42342410490.pdfIn PDF document text
    • http://veivel.com/userfiles/file/piwonaxegudesimek.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b289415286b---98780561390.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/68780127415.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/47866340416.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3695cb8cf867a7a38d67bf72e938c373/10063750277.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/dixolov.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/075e2fb2055ea52d2a62e0f62bbefb97/rijepowukeguzijas.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xepexipikememuwixebedesa.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4hctgbco36k3ov49fr9ios2206/rudagijawotawomaxoz.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/1932547532.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/88740185116.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63908dead2---wojubojexuvukabilumore.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fc928c8b73d5d86ddb736f25501e4bb6/gagizerujaganokiwizefi.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sodojivefowefuzedokug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+get+unlimited+coins+on+bejeweled+blitzPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 26320 bytes
SHA-256: f95868ed22116035b86e46f9d2c294c06e2727d8e67bb8ceee35de644ebe95ff
font_01_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14314 11072 bytes
SHA-256: 9f298e3e7873ce14c8257883e41894b8cdb309e3862d443d9680d614240c1496

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