Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d5fd616969d2d5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 05:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8d596b7cd77369b2c33297297db1777 SHA-1: 32440440aafd2185108bce72bbc54a657ee24951 SHA-256: 85d5fd616969d2d5176393c08c59f0b39789f6c9c9acda738034ac445e65512f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a phishing site or download further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://vanchuyenduongsat.vn/upload/files/74300331476.pdf In PDF document text
    • http://liqaa-lb.com/files/userfiles/files/24540569618.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/79885248129.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/84143297050.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562ec7e736---14339732976.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/jopugixogiriwezewit.pdfIn PDF document text
    • https://bauarch.bg/files/xigov.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/suwixuwobeg.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109101245114212.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uen3q4ltt5armtqrajmkccch7g/wopiloxajis.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/liwamogevikutepivorir.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631422269.pdfIn PDF document text
    • https://stvorki.ru/files/file/topalogofobe.pdfIn PDF document text
    • http://polipack.ru/content/file/97826606458.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131616c15c47---susaroluzakijekorolido.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/jobidu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40cd1d662---dexejuvag.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/fenolujukizit.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd03a19db4---81937582289.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613335af29244---75475740863.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/4967069363.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210904_7865C5640ED21EC7.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/23768727970.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140068159a09---13799502069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=harry+potter+1+online+moviePDF 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 10468 bytes
SHA-256: 6ede4b104a85387a8a023bd62e3a948d065bab71efb7d13bbe04ab5b9a7f9f93
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 17860 bytes
SHA-256: b06e83d011bce9eb351bcebf1eadbe828130255eb59376dbd30d76e00840d517
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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