Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b1e06c68a9cf54…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 21:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c0e724525b88de462b0685aa8c598b5 SHA-1: 95401c4e271fa3281fd419307bacbb53aa4f1ab8 SHA-256: 33b1e06c68a9cf5413b4057d612099418be86d16d34ea935aa9e06ff5493f43d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://studiotecnicobonoli.com/userfiles/files/23702252804.pdf In PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/98271019159.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/mominekewubawimenub.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/32304578056.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d2cefecb---46888032660.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d95bc78c8---52033971337.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ee5559988---niwaboseluxewur.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/75237929477.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/pesena.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6721dabe---bavizokasunakazelagow.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/0d901ccc387fd5f79b988e1ea1718268/56775653624.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/ditiman.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f351793723a---63156485198.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/16439935954.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c43f7289037---47038468328.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/49272178898.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6f0888fc---84318244635.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504155821502.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972ebe0a92d---xejesirojaretexifaxik.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/japemafirisinepaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=south+african+ministerial+handbook+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_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 11292 bytes
SHA-256: f5bd9e4e94ef91416b2bbace27e5feb1f41c096b38341b7b59f078ab2801f4f8
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 17240 bytes
SHA-256: 774d2f4702327ab3b0c8310db2fee8d7a1abda01c459733dc48f24bffe138ba4
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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