Malicious PDF — malware analysis report

Static analysis result for SHA-256 615ab5a0a1a78ea1…

MALICIOUS

PDF

88.6 KB Created: 2021-08-02 10:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adb66641ec5ceb4f683eb463ac435b6b SHA-1: 3d26373fbfc780a94d0c7bf475592e19180a7794 SHA-256: 615ab5a0a1a78ea1dc5e91e544633d2e2b58deafeaa5a5dc9d9e994da8f7faa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=how+to+work+dash+egg+cooker PDF link annotation
    • https://ajitcoatings.com/uploads/jisawidotesaxewazud.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085773e458d9---52272669020.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/25727b22b1b906b27a7e66e3428a1c0a/58001691208.pdfIn PDF document text
    • http://mopron.ru/upload/files/57414875319.pdfIn PDF document text
    • http://eva.am/files/ce0aaaceac50efc1.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607062d93362d---25695363015.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3368e4e4d9---91613418575.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992c53f135c---pimewagalu.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/8u99bfmneafagjolc46i0fv977/17997933663.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/99875777175.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec4256e621---kotabipemovod.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210714120658_rhxvgj.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe4d4a376---zelem.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/birodanorugukawuxebek.pdfIn PDF document text
    • http://dhf-china.com/d/files/10852171370.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083282776fb7---28028445896.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xojodekiluzobolefazarik.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a20a29518---61493142982.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/846fe08fe41fd1222a26955a25165105/18004788967.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24701c7ecd---73267415118.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f6067e3cfef6303bfc87d699d593d9a3/68859871319.pdfIn PDF document text
    • 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_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 16656 bytes
SHA-256: b6a9bf4ae20eb75cb8df1f5fbf50e01d95ea2ba93fcf1bc79fb8de2231bb04f4
font_01_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 10576 bytes
SHA-256: 7a1dbe1e38146a06d227ff0c72158191ec9c49b0cd8c64f5247e8917f95fc3ca
font_02_sfnt_off00013d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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