Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafa36bf69f8e940…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 11:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f67866f4c8bb06d88208c8a7c88dd1e SHA-1: 8501b30466034d49ec4f06b944b08216c7b573e4 SHA-256: cafa36bf69f8e940d6b0da3ef62006f2f630954991a730ddf0a5a32c0186f856
204 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Embedded JavaScript streams are present, suggesting potential exploitation or redirection capabilities. The document also contains numerous links to external PDF files hosted on compromised WordPress sites and other domains, likely part of a link farm to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136642bd541c---vazabogexepapawopelalivu.pdf In PDF document text
    • https://conrays.ru/f/data/1141513428.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15f0e6aea---venututarusovaride.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901094652582942.pdfIn PDF document text
    • http://weingut-suppan.at/files/21274673920.pdfIn PDF document text
    • http://qdjshg.com/files/file/nowisezalavafu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fc631e10fae7152d2bb6906ae2292f2d/boxunuwesonikegu.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/5055991441.pdfIn PDF document text
    • http://ktcz.eu/files/files/vodezuzifaru.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/7449920333.pdfIn PDF document text
    • http://hrudolf.com/userfiles/kizololexufoliba.pdfIn PDF document text
    • https://ms02bet.com/contents/files/20945618613.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/65931867098.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/39889718960.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/74610764052.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56f2ac590---1510238444.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/lelexiba.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/nonamekomabunuxugoka.pdfIn PDF document text
    • http://shesob.com/file/files/varitor.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/nakusunomilijez.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/56306196722.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vemukaxakepuzanisavila.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/8892731952.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/21864870016.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1b99bfec14ee53a4d43de257a52aa004/vixowedukalalavumad.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/92557556114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=extensions+chrome+tabletPDF 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_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 10720 bytes
SHA-256: a80b4dffe121fb8b416391d4e09eaf4a001f2115116b86de1bf63d46a7bbc275
font_02_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 17916 bytes
SHA-256: 9f937faaaab57c566684021b9d3c3cdcbdffbb485226af9fc3ec5b405de199f5

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