Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fe0df578339e1d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 01:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4102429eac3e2a8a343eb4cf76e2674 SHA-1: c7d697b045ce6b5cc863dd8ab539e1d1e2f3e427 SHA-256: b0fe0df578339e1d710478e2c684f5933c705d1d6e145965af44c22c775efece
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://businessdevelopmentcenter.pl/uploads/userfiles/files/53848312414.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b349981153a1f0f0c56fa22d85a7c1c8/fomagata.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/15480514802.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b6af3df2d---bodaguxazuxuxukusumuka.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/vasadapalapidel.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7108c6931a---sukux.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1b3e1a9---beziwasazimoronigodedibiw.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/tizonivojapozoduwute.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/610377e7ec5432c81458537c682ace55/vodatimimisujobes.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/3879988242.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85968649368.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/43218422594.pdfIn PDF document text
    • http://esangsok.com/upfile/files/milolowum.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7192b6698---15381391070.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1627583625575100944.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a881efe5addb89dc06a6ec4d1bc072a0/91221387360.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090833fa137c---39764980047.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e280c76e33f784a4ca0e0d7f573fc982/luwabivomel.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4c1v1v69cj7sr2g7s9qqog70t8/najirofesivogelejor.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28fc36047---30032965603.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6a9923f21d0cd8dfc52a4d7d09f7a026/luvevujob.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/pelowem.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/54764130549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+scanned+pdf+to+word+i+love+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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 17308 bytes
SHA-256: 49f3df9510a36b9b787faef0cc7642f95e574cdbb09ad16ab3da8f3b72d0ebd9
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10796 bytes
SHA-256: e7c9916e17e79ff2bbea01227a12e7e3afbfd686fa4bec63091152d3bbf558df
font_02_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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