Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d131be93f503797…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 07:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 317ddb268541c4c29effcb6629dc602e SHA-1: 73e3a4eaf5a7ad799f4a93a60e7078ce49acd96d SHA-256: 1d131be93f503797b10ba46c3ed2e7560fd76efb66e0107f05dc106c8de02c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware delivery. The presence of external URIs and link farm heuristics points towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c4f0e7f6e4ef52e0fbaca125b75ea60a/tewowi.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7fbbff0b0023b96c7637ae813187ff4c/redomogutivamujanutud.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b00fa766f38---98456629490.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b7cccbd78afbeaa6e6bc37858a6df06d/89676195516.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ff61f1eea7f36c96a0c3f2fe6eb39b1e/zexomaforituxe.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7mb2emp1qum31k50laenf6shnt/tupaxodojeludafofirux.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f8561ece10f789850d4e426a191c8a43/sakexurigisidep.pdf
    • http://charivne.info/images/file/76584081295.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16076a01b577f3---gakexobipadonoronurotaza.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5618ce26---22772732301.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/19b51e313b140587957ec47d3a8a5789/2814074402.pdf
    • http://palami.by/images/file/durigekikozaxuwupirozeti.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e43dc861b17136070dd93b5b5bd1e6f0/gefuxojavaramedap.pdf
    • http://verkaufs-akademie.com/userfiles/file/65980835879.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ce79e820---wepisadumofedesaguzive.pdf
    • https://smartstone.ca/userfiles/files/99275510968.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d092d45f7f7---77876609716.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfb84435b---kukeviwir.pdf
    • http://modnyi-buket.ru/uploads/files/darunalim.pdf
    • http://gld-lining.com/user_img/files/5302405594.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/15769083983.pdf
    • https://nhachoxebus.com/upload/fck/file/tosifulixigupulad.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc927bdc1---runan.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d029b420db8e039e16b1ad7a4f5bbb3a/48550768927.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608feab1103bd---robipela.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=plymouth+rock+technologies+stock
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f222.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
font_01_sfnt_off00010a34.bin
4acb7141bb6648fe04df9239d7621b46b028af92dc32b4f03bb1ac53bd9f1724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 17148 bytes
font_02_sfnt_off00013714.bin
fdedb88ada62c5ff08fb1b1e742b32dc03539febd2dcbc13045783bd4917d3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 10824 bytes

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