Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc899d71e313759…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 01:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: cba4a553f6bf8ee379e026671fb8faba SHA-1: 9fbde1f4d67e0aed30dff533e6ec7adb949bf068 SHA-256: 9dc899d71e3137592e4d326ea837925e72d42ab842b1b44cbb07b7a5831039da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=coc+gems+generator+2021 PDF link annotation
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/sotimabugolowu.pdfIn PDF document text
    • http://sjhtractor.com/d/files/71253840174.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/xanavopitekikepaweweg.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/vupesaxotaxowutan.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/ruwezasigigaxaxo.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/60928990419.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/wuzagup.pdfIn PDF document text
    • https://videoeffect.ir/data/file/32583296444.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/05914ec1bbca55751810d155905196a8/72595446669.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/39625363185.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/3901367767.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/rakadamufi.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/13866362231.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/pomojewovunutew.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a60b18a54d45eb987cb3e8c8250772e7/zetomegesojukidobuzuzilat.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/40472033271.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210928_B33FB1CC8163E1CC.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/50004122304.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/raloxeviwigafapu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e961478c8a---jozasugosejaxoxenote.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910125932.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ijdg8m1d6hhje2k05dlakjqba4/zabojelidi.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_off0000b58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58B 18188 bytes
SHA-256: 04fb10f32e7b52cc1c4d669722d0767d10cea8d0585b761c7383a1910d6520c5
font_01_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10760 bytes
SHA-256: 4ca7864406f0be1660937f4953e42543f3cf2d37ebf473757a8b77c84e755fa8
font_02_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1