Malicious PDF — malware analysis report

Static analysis result for SHA-256 160b820b6c5466a5…

MALICIOUS

PDF

89.6 KB Created: 2021-07-14 05:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5482a5d99e48dec82041c91d81cba8b7 SHA-1: 6d29390171462209ff734a1c0c302ff703a15dbb SHA-256: 160b820b6c5466a511cbf0c951d859675f5b82005aa4c4c2b84e616686542318
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f57f9e073---piguwifupidapenuridu.pdf
    • http://matras-devison.com/upload/file/pawuzolozorar.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/74fedb365294604e8156b67b210371fe/jizakajebesakadedovositab.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fee464657e908e9d8f6c3e5a1bdab19a/fuvotezimegem.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a10239be86d---juzefebu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6fafd6be38ad355d190c585fe163a899/2589255691.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3c9a0ab9060617ae29580c16141d1a38/visop.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/be6fb28e2eee1fb846fbd1348fe9628a/25155199128.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rosaxibog.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8aa310cc931955b252877f1d29f1a35d/gebuzenavuvajopa.pdf
    • http://pune-india.info/userfiles/file/3368367495.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1222ed3---fokidefi.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d286b99e25---97988135149.pdf
    • http://vorne-sitzen.eu/pcms/content/file/novovalobosejo.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840ee266c8---97084895087.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/lowogofimelebubolelo.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aa2b72fbb65326b2aae4ef2dfdc8d747/82162241564.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b442b534eee---39966075164.pdf
    • http://malbreil.com/userfiles/file/titeriga.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5adbda4a912175c61aa669067d383925/mijojavaribogumadobaroru.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/92786754983.pdf
    • http://alpha-cp.com/userfiles/file/21491834526.pdf
    • http://jubileejec.com/userfiles/files/29981738791.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+big+o+ending+explained
    • 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_off0000fe4f.bin
cd1116d10e2ca2ff6ee29abf8b45344c68f522041ece032045d373ea74aaeb1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 10508 bytes
font_01_sfnt_off000115a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
font_02_sfnt_off00012db9.bin
3000d8475ce2d0834065706a12c048829e5b4739dffd2a5fb48bf9e30c938a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 17160 bytes