Malicious PDF — malware analysis report

Static analysis result for SHA-256 1297c4f20b81d13a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 08:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04842b2ac088f78b34a299e26149fea0 SHA-1: 076dd426f9be19021feb20d7750d54f5c9930448 SHA-256: 1297c4f20b81d13a4f2820049a862376da0f22983676d916e526e4a82f57680e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body is heavily obfuscated, but the heuristics and URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://yarpaket.ru/userfiles/file/lelenuwunudufuminovulokog.pdf In PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/56171068481.pdfIn PDF document text
    • https://kermanrooz.com/img/files/93060156823.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/tibonog.pdfIn PDF document text
    • https://forssh.com/userfiles/file/jujorojesag.pdfIn PDF document text
    • https://tebra.si/userfiles/file/62691938862.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/pagajubagew.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/33661297605.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/30933132611.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/032219579797.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26332972e---93788396173.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080610386456.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/mojawebigumuzetol.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/snib6f6qkkqjdaocl9o8k601ou/46629252690.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137310fd38e8---74154197743.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/89418222045.pdfIn PDF document text
    • http://markone-tools.com/upload/files/benizesolupuwadituwarotip.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/37423280138.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/35650773518.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/13629107275.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/75162051379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=top+5+best+offline+gamesPDF 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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 17168 bytes
SHA-256: ddee7124c3e252bf2d7fe14a0567de6dccfae5a50e7f18fd727f49fcde19daa1
font_02_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 10836 bytes
SHA-256: 4fffc65eb2db5f1ab248c66b711142e2bb6cf71bc9c74e6807f4c7848d6f5797