Malicious PDF — malware analysis report

Static analysis result for SHA-256 747b11a8fb1f315e…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 01:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6199019ba231ac9af5c63afb1e5ed57 SHA-1: 91f136fad69e142e96878d2fb2229c2feaa5db5f SHA-256: 747b11a8fb1f315e5dfbc28866ebf4ccbf5aae4b3ac9151632ccc773912b0f2e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irk-yoga.ru/upload/files/63478341614.pdf
    • http://evpltravel.com/xv_image/file/purimipelofupiw.pdf
    • http://giaoducvietnamtv.com/images/ckeditor/files/bigimonadanobezosazi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160845fb68a219---fifipimab.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6cede75f8fbeae224fa1ac7d6975741d/96745136748.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2890772c---momekilaribip.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7af91b8c3fb323e565874b4d1bf9e372/78286280603.pdf
    • http://rainbowcaterers.in/userfiles/file/12883556419.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160810b3a9a14f---mosuxokexarufotupuzuja.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ef407c93---juliregamitamegu.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8db11f88dc7f8732c0d61f835741b847/39776911757.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df3496c4e---lavovesimizasotazesija.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/rixawiro.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608305c0c96a2---mexusota.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/91a0posataa2ieh9krn2b6mm4b/rusofitavunerisoduwekataw.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a54602ba0---12368084343.pdf
    • https://aquafilling.com/userfiles/file/niguvarokofob.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/96648929338.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fcfd47e2b---24982949207.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/da027fc5e9dbebf1e901fc8402ace1ba/jikuvanim.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a44310e---feguju.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b3e65be---nutidaliginewowokakujufom.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3f1c9f97e98216a970dc190190e463a6/kadumedavigupekodova.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160867379622f8---pekijedage.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3b654d47---mukofetesa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+numbers+to+prank+call+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 16792 bytes
font_01_sfnt_off00010590.bin
2abae442098c526e44008198e8f78523b36a196b06cf232e58c7d69be6c2127f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 11068 bytes
font_02_sfnt_off00011f3b.bin
60a1c6c0d11743865e36e82cc7aaa8b8f4d62894190133091b7655ab01afa293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 17684 bytes

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