Malicious PDF — malware analysis report

Static analysis result for SHA-256 51921f0b49369dd9…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 16:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c02f6594655b852f2c8b796fc2c6ab4f SHA-1: 1907e23ac8f1fb4b11d5e59e2297ef94734b32ae SHA-256: 51921f0b49369dd9cef4169e71ba043a58443420027acd813a1ea70c518ee76a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/455978846d8ba1eb33c657ade8c4bde9/77342598539.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/f88am9rdt4t0hspk5rm0prva33/madaguponi.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a958b2fe48---71750961578.pdf
    • https://vibangnhadat.com/uploads/files/geduzozedu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99d34627c2---7889354601.pdf
    • https://lasanisports.com/files/tosofifoj.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880432899e3---33182476485.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b1f191eeb---63920192085.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d481b98037---40943039102.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856942b54e2---javakofoju.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h1hhgg2pjhp6o0mr1tjhjcd374/54877129393.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/feromuwigi.pdf
    • http://starrsgazette.com/admin/images/file/64807249654.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=watch+the+vampire+diaries+online+free+full+episodes
    • 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_off0000fe5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 16792 bytes
font_01_sfnt_off0001166e.bin
3ca7d70dfca87385e8b4893d352841b07613b167bfebf228f96336a6772c8bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 17652 bytes
font_02_sfnt_off000144f7.bin
9f7429b86e0e260765949e6557278226f290b4aa7cd7940043c2cb5988f4db7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 11044 bytes

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