Malicious PDF — malware analysis report

Static analysis result for SHA-256 511c532a6c66b459…

MALICIOUS

PDF

82.6 KB Created: 2021-08-02 21:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f74285f5c70c9f3aa7056b06daf15f11 SHA-1: 8595a8edc002f2cb8f3e05c5857c823a3032b637 SHA-256: 511c532a6c66b459057f4afc485626a0ac836688c5190e1f92574f1ea3560b24
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or utilize link farms. Heuristics indicate a link farm pointing to compromised CMS uploads and a ML classifier flagged the PDF as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. This suggests the PDF's primary purpose is to trick users into clicking malicious links to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eugensa.lt/app/webroot/uploads/userfiles/files/16715693532.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddb8bfeea---88596380282.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/46551767292.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5e290cf5---jowapefogupekizowozovo.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kotukavopinoboxar.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2182ef0e81---manupoxono.pdfIn PDF document text
    • http://rld-carbon.ru/file/49468526673.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/simesapuwupetofadanun.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610826bc4fab8---dulevamukowirul.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/80269299549.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/67489244457.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/65277572312.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/109a85f085d10725e897b6c7213d4547/79503999967.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/selak.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/buwowerawip.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210615152939_3vv7bz.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/3017600188.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qpaks564hclgq1j9e7unvubmk4/77349423523.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098477087df4---jisivipapuzuvo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e02b1803c---pututapuwupasegaketemik.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/bu9ljicvf09psjlrll03i3r0o4/ximaso.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f07ebd54---pesidinomikefadizipawinaw.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e168f6cf---28325345797.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/54067895405.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098adb153dd6---6543870295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=auto+robber+jailbreak+2020PDF 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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 10516 bytes
SHA-256: bb9e09a1d0f0edc89e33ae2b724df7bd1b9a7d0fc800387ef6510841b5677812
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 16928 bytes
SHA-256: a9be1ad6a790eca1b98efb58b5415dec38d62c98ed542a7bf49c76656683d08d
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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