Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0dcabfa4d90a46…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 13:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f010b36f1a2f361d04964097d8e6d7f SHA-1: e62d522eb9ebdd2a2244a317b7d4765596e81349 SHA-256: 8f0dcabfa4d90a4665a21cbdca52d7015576763a963f9fa1f593782eb85e9ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The presence of multiple compromised upload links suggests an attempt to obscure the true destination.

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://jaatkinson.com/userimages/63883357749.pdf In PDF document text
    • https://superpart.com/files/95831845520.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/wezuviduwokojusilefisemo.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210811_191254.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d31d9179f1381c8ebba4aeabfd70537e/zukiwuvafetevode.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e79f3bb8e---fonefifagavozevu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3a60e168---sixujasukabunujesipedo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/xubavamowofow.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/54316987156.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108280029115668.pdfIn PDF document text
    • http://vce34.ru/attachments/file/32534111378.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202196955362478.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vetumanulatat.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/norefonufejowijinor.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf7759270---vodebesozalazuwaxoma.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/79782025511.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a519faac0dd---xisatobat.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/xabofozolenuvebutefipoja.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/68371715188.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/16193563612.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/kosipabufubenonozin.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a81b1ee21---rapevixanoxirolufawovan.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/korexinadorekavukeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=picatinny+rail+dimensions+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_off0000b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 17136 bytes
SHA-256: 0c135509d1f3c894e8a7e7979e42fbffab170618c8e021b6f8808dc1a1d7fe48
font_02_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 10896 bytes
SHA-256: 3b1ccd0b342e8bcca87447d1fa8e9064833c315f5190cfe1e2c4b188f0321eaa

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