Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc73be1e3bce409…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 16:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0741616a94b6417a268dba3b0205eecb SHA-1: 4689be4101e25fe23d4f338171f6690ea8d13347 SHA-256: 9fc73be1e3bce4090adfcc57917f4fc04d8361bc50bdc779e15cd0ac107067cf
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick users into installing a browser extension or update. The presence of numerous external URLs, many hosted on compromised CMS platforms, suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall pattern points to a social engineering attack designed to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=homeopathy+doctor+in+panvel PDF link annotation
    • http://beergolfers.com./blog/images/file/kabefigugitexozamiron.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba203d1db1---34944175527.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/dubar519ef1doegsonttcd0t3p/41605263403.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/96491692411.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/ruwagarilijaxefuvubajesa.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/rokitunogufimu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b42d2af46---vijuravive.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/13845960597.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/856f8353bd3b51a98cfff8243e400108/71130265932.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/suzapafufifirobikabot.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/ziwavegejerekamubukezena.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/98947684161.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/godafatedub.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3c1ad19ebff15f0dcb81330193708612/5577319076.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/62730764506.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210723_155542.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/10530593608.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fho35fc4akl167bl1pn6ikeudo/99591188032.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/kugoposukemedul.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a49598c8b2f91c0ae262785450511e9c/lozasif.pdfIn PDF document text
    • http://guowangcable.com/d/files/ripomafugupenif.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/26442668243.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/78055105389.pdfIn PDF document text
    • 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_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 10784 bytes
SHA-256: 2085c25312213cde02dbcec05b7e27fb3b79077d586a6520a41d6a80d50ebaf8
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 17768 bytes
SHA-256: 16d8dc754e3a3f560d1c751ff87989296df1410f4f4f03a73afbbb37cd894761
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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