Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e14125642ccd2f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 15:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 980253472ab1e5f34b156435b53daf9c SHA-1: 35560993178c2f095d74739951477d0ac53100c5 SHA-256: 69e14125642ccd2f2eaa4e5d7c886c1fc8aa734c5418d13f8c6245c2fce06dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=bdsm+games+apk PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/747770257927dd9e5f9123a4d6e679b2/38295943449.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdce527ffb---99825701131.pdfIn PDF document text
    • https://onlinendttraining.net/files/80566606215.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/66622160934.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/85202656745ed8cb68b6a2c42f88be5c/ralolojizegujogoru.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/kikorawowexir.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/zarog.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/gobosikar.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/dowutulukozonuvigu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fa88617763951f5270f3232e1347e553/punolukejowuzupeko.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144a82987462---ripilemevakanidimijoxo.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/26897972296.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/nosanoru.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/sopozufigesuwoxubabeb.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/wuwesuvefosuxijosaweku.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/50250133481.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/turirujejonuj.pdfIn PDF document text
    • http://aweibel.com/Photo/file/97938171348.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/52709722985.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161377d32e403e---51589251159.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/29932429729.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jabimafofofufutige.pdfIn PDF document text
    • http://belniig.by/public/file/kikomuzevifulewi.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zopemelipunijuj.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_off0000bb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB02 10320 bytes
SHA-256: 9a44d704b812b4e46de730800a1d0812a9f628a5376c86d1c397cea8712a1e22
font_01_sfnt_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 16384 bytes
SHA-256: 821e39af9be0815b1d1329d24f229017d731f39ccbbdef3634cd1da4d0111f50
font_02_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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