Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a87c34a9923c125…

MALICIOUS

PDF

89.5 KB Created: 2021-09-04 07:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c8a374ba68d9e038d89838fb6bb0242 SHA-1: 56d4ee559118482cac5c9a9dbed6f28f8acf12ca SHA-256: 9a87c34a9923c12528a7f1672b16beeafe43c020d556e82bd6004a98c3b31dfc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a397f604284---zejubakirimakapo.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jsisqba8hl4lmhnnrhukc61pr2/24225487504.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/41817901114.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dfdddc9f539a9b4ad8db15a5d261df1a/renufawanezojugedapazadek.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea7fbf5db---lonolir.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/bifopuvimufujilane.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/fujujobemuzezanagubetiruj.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/90644075723.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/molinibumezuwaxixerivuja.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/kezaxededaniduweri.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e935f5a524b---vagobavag.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083004e3de34---82263761889.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fe1468f6---28600383221.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c66d3c132---30387708437.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/ramikuw.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/zifamifasufosedubarali.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/97535642478.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/5655592686.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/84082633690.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/33335882232.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161253c1f13b4c---15602955485.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tufexazuwizuxez.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hofqhbnslq6lkbn3g6t70vl86q/84840904877.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a637a7088---56013412928.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/57128822067.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/94848484661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=comment+avoir+un+esprit+critique+pdfPDF 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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 19928 bytes
SHA-256: 0310ced3d01e81f8563163994ffbb8866b01307ca02b37296e92e6c48f75b3cd
font_02_sfnt_off00013c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 11076 bytes
SHA-256: a29227b3a21d84dd9390485d2b4109bd9cc0573700a49a43284c429f8b29ebc3

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