Malicious PDF — malware analysis report

Static analysis result for SHA-256 c293cbba99f98f5e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 10:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85121f4a06fc834aec123a011eeed9b7 SHA-1: 12ad5ac8d5834934b24fbdacc3b5535f2753878a SHA-256: c293cbba99f98f5e4806011985c9f4a1f00acc0231c1b425a89ef40f77598aa2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://garglob.ru/uplcv?utm_term=pokemon+diamond+sun+and+moon+download PDF link annotation
    • http://www.gamylai.vn/uploads/files/jojisow.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/51325537083.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd1339e97---43697802950.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/79128834874.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/rezadodiriwonomadapep.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/8683263217.pdfIn PDF document text
    • http://signauction.net/userfiles/file/37229579963.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418d21e1d82---9570546941.pdfIn PDF document text
    • http://farashimirooz.com/files/nedoganumibijuxufik.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/55820954820.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/44883141633.pdfIn PDF document text
    • http://sushi-belovo.ru/files/92060545580.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/27071676157.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a668ea090a---bejepujasirida.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/25928496711.pdfIn PDF document text
    • http://salt17.com/userfiles/files/60326955426.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/towutetuk.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/83086476951.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/98754505905.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/54839835843.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/mamuwolegaxizujaradogox.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac55bbff7---zejunutuseliloloxuguza.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/431cc6b7cfdfbd3246e13f3f549e4e66/22024732675.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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 10488 bytes
SHA-256: 50c35cbe1cb89f9b3d09205ddbbf93431de1ef07644eebc3cd2f6e9d68f9afd7
font_01_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 18596 bytes
SHA-256: 0024d21e183c02816d4683fd64bea25820e245f2e8fdc7e1c7ab416fada74cb7

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