Malicious PDF — malware analysis report

Static analysis result for SHA-256 555e7d89de513691…

MALICIOUS

PDF

81.1 KB Created: 2021-06-25 13:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f51525f55216c8f0c62325d845c86dd SHA-1: 7a87674cc25d83f475e2bcf7e8169a9f6545bd9d SHA-256: 555e7d89de513691c06bc0f4f701b9ca0664d400c988b43b3280e82abcedbb1e
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The PDF structure and the nature of the URLs strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://accessiblevehicleservices.com/userfiles/file/pexatofiduxifemeluwigivi.pdf
    • http://aimic.com/userfiles/file/dokube.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2e3b44268deff245ad0425b94c181bbb/13926826074.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2de1eca4be993361d03668c54f250645/26171716782.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f3d23dc46e81ebea1dbb98ea6dda9525/telupituxatel.pdf
    • http://ahkjt.com/upfile/file/jukive.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/kikusilevasapedoruniduxi.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9f367fef---nojufozawuwuji.pdf
    • https://icbacademy.com/upload/files/64125455308.pdf
    • http://natproperty.com/userfiles/files/jaxejowibajagidatel.pdf
    • https://hashtag.school/userfiles/file/situlujug.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808bb6d68bd---gawiwikobiwuleb.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160933502555b9---42157223676.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mqm11aeb39c53494aol1kb4que/xuduko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chest+burn+cure
    • https://medlineplus.gov/heartburn.html
    • 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_off0000dec6.bin
bb96450dd4d27a16b7391eb581ba8a7a8b1005e5126f35b630e4aac88a07bdb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10180 bytes
font_01_sfnt_off0000f591.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 16792 bytes
font_02_sfnt_off00010da3.bin
eacba2b1df6938b5fd674a5170960251ecb4495471846fa5fd6892f77205bb0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 16396 bytes

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