Malicious PDF — malware analysis report

Static analysis result for SHA-256 a067940defe36269…

MALICIOUS

PDF

93.6 KB Created: 2021-07-24 15:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a0226cb0a70b35ad36716ba25683fe2 SHA-1: 21400d2d0d3ed61e5baab9197c93654b565b3541 SHA-256: a067940defe362691e1744bde9d3b8802e0537ccf13299e0cfffdfa38439b22e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host other PDF files. These secondary PDFs are likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v8kuddbs5du1iifqr3ggkquujk/rurorusovi.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bf8079134da83bb7f2194ad503fc3140/90345234912.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076253c4c388---82544782575.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8f786f080---4936533552.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2977cc0b4e612dbd3dc7ff05fc78e094/fobuxi.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/09bbead6cf913c975708009a1d4d3360/40150564045.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607457a0f2533---70958750839.pdf
    • http://pphjako.pl/userfiles/file/77415247009.pdf
    • http://mexxeopaint.com/upload/files/71289162186.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe7391b5ce---wenolupisozuxirasagiw.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/l8rtdua5nfc1s2fjk58okcb0g4/83181455753.pdf
    • http://ekotop.eu/userfiles/file/21546050201.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650ed9739d---jesapadakukojiborumexor.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816fd99cf0---12868658483.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa333360e4---66253348339.pdf
    • https://a2designbg.com/userfiles/file/39983331810.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d98c30e3a1fefee1ab525bd9768f31d1/faruxamotigefebanazikefe.pdf
    • https://nguoixunghekiev.vn/userfiles/file/gusinosagutitaru.pdf
    • http://adveotec.com/img/file/6319753704.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45027409176.pdf
    • http://instant-image.net/UserFiles/Site/File/29152062839.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c89e7a5484fcd7f7fa0e14bf39409da7/16217907126.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/tavuzobaz.pdf
    • http://abpaluso.com/upload/file/61641011390.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dinosaur+battle+world+championship+dinosaur+list
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05e.bin
fb7337e3ab94621f8ba6f9a3be0bf1cb84c0db07be2c1f0bc0e23f233eb10bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 7016 bytes
font_01_sfnt_off0001092f.bin
e89d246a2eb0ecb1c9c40f784682c8f475266b4b178ae6cb44fa23a1591b5fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 11108 bytes
font_02_sfnt_off000122b9.bin
8e5bc72a2b67f24f8469b8aa7c00319712535191692784861232d93f799e7295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 17176 bytes
font_03_sfnt_off00014f95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F95 16792 bytes

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