Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc056e9aacc195d9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 07:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9ffa0a39f47030f14c74e25bcddba0a SHA-1: 63ce5b0c541cf55b6430d2e6c2ab785238e7a07c SHA-256: bc056e9aacc195d98fdef520d8a771f4d45757e81bbe2656a6e854663ff7e437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://worthingtonpark101.com/userimages/mabod.pdf In PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210710_FEA77264282A000F.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb50543e25---59249310922.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/nobukerubuf.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1j1uoab4f2umh71bo7g4a8ijlo/6620336849.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/92fi3jdee1bgig306sahgk4sl0/97600051720.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f0ba12dca---31041148481.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tl34miaifcvl2u28tffgi63rqd/vilaj.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xotedozujufavida.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c718c599adb---34490577341.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/woxemopevukugejuper.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e52f2935da31db91c07f847ec8751a64/vesito.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b61dca68708---60069570214.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/39177770.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621380808.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/nukilifevifixejonerot.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/taxokuretobikatixo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/21dc03b4a38114ad42e5252b3a2e100e/xezemajexabigamosip.pdfIn PDF document text
    • http://ipublicity.cz/data/file/96009227900.pdfIn PDF document text
    • https://ms01bet.net/contents//files/36901902054.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/sonulusepugitiporuxafaxot.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/tegupevofavibiwitatoraxol.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612cda06da751---94368021831.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/lidoloxefifekasel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=printable+colors+worksheets+for+kindergartenPDF 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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 11076 bytes
SHA-256: 47f90504d48e60fe33fe8b22dd62d487a6d96462ba9183e34c1da28a279c6005
font_02_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 14768 bytes
SHA-256: cc43d25980706cb7c7b913c2571c524b3006056b8655f6b88e7d4bd513e370e4

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