Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c45f789b4cf8331…

MALICIOUS

PDF

75.1 KB Created: 2021-06-25 16:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1dbed6771e19cd16efd813640a23230 SHA-1: da3710f677532ec0fe476f0449b97a07c8fe06e9 SHA-256: 2c45f789b4cf8331b686cd349afb9eb4ffa93774439ff3850b9324ba7c866ab6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/46938884979.pdf
    • https://sinhadventure.com/uploads/file/74830440045.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/36c493708ef7581f4364b547bfd461c4/tuvuwoliveb.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3214130f---fotagojutumu.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1d36ee0a---mumazujapesumejoxakij.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430090139901785.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3fad0240efdb977d0fa2355040ee6317/loxudapafozaxuxogum.pdf
    • http://amandatravel.com/userfiles/file/pebojutabibiwatobaju.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/96911951834.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815b28db62---fokewazobo.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/43396578543.pdf
    • http://tribo.kz/userfiles/File/nereniki.pdf
    • http://a-kamen.com/userfiles/file/63521953750.pdf
    • https://aduanaldelvalle.com/userfiles/file/28842601994.pdf
    • https://appvid.eus/userfiles/files/repifuvawojozevujivafi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cubital+tunnel+syndrome+occupational+therapy
    • 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_off0000c425.bin
2aad5881ed6b2affc34c543b4cbffd9f450c87ee1e6143376b493a18d8cef0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 11164 bytes
font_01_sfnt_off0000dddb.bin
bd49673752fc60f3c2b7fa55ab53601a74a370b62d017b49dc0ac5ec413cd37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 15928 bytes
font_02_sfnt_off0001075c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 16792 bytes

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