Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde57c171e3906da…

MALICIOUS

PDF

93.4 KB Created: 2021-08-07 15:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dee1d532a320bd4ef7f56be469c63b26 SHA-1: 09d5e4cd60f823fa78191c720001fced9e38fad1 SHA-256: bde57c171e3906dae887fa94de4edadf865e4e62f2b06bd4abfb6ded533a126e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to host phishing pages or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://csc-021.com/userfiles/file/20210625215340_8o53bt.pdf In PDF document text
    • http://sakem.org/userfiles/files/jinexivufaki.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/157213331a97b9f36a12a6c1ce448bee/18611261580.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/69a915fc78000d93808a3eef4f260f87/zekiwomolaw.pdfIn PDF document text
    • https://esz.jp/img/editor/files/82258355983.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6027ab18d8e1a53d2cdde562af29dd67/widofadewenumorov.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/16890525337.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3de433107ea5fad30566b5dc4145b6f3/35338733148.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/kexabexofagemivuvomu.pdfIn PDF document text
    • http://greenld.com/userfiles/96057520328.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7g2ovutpmrip6j9cqbd92j0qjf/6131325320.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/24448fe3e52f13b6961560c4c4a645a6/fexobeb.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ai0rqtkilppe3rlsrvh33dkajc/81364769033.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c87b66bf6612afd9464f43c82d3b96ca/sisudozavilama.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/21954907108.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/18ffd2f789ea81b2f97159cd1f5d72b6/34695756777.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fcfc25e3f636b33d0d76e8ad641f3b46/burexinutaf.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f617de3165---22308154895.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efae0b4076---74444822903.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e3f4b86ef363049a589dd622a0439c57/62647139733.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/zoregirexerusitafapife.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/72806141029.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9714660cde---21025110160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=which+sentence+is+an+example+of+the+imperative+mood+brainlyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 11300 bytes
SHA-256: 013bfda8702a59f55c39d8cc13bbcc1b8fa100610a1e33785323ab457b01c2e6
font_01_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 18936 bytes
SHA-256: df8373a0aa819ccd456aec56adea7be173e7f870d807df2266b24b08ab32e72a
font_02_sfnt_off00014c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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