Malicious PDF — malware analysis report

Static analysis result for SHA-256 fded2c73b60f8e79…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 02:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73fda50bfb0bc2c6c88d12f060f29c9b SHA-1: 851eba1d85fe285c0070aa6e6e76e7d2d109dcb6 SHA-256: fded2c73b60f8e79e6fe58898006d0f86ac4bc4d304f47304a82bc99d0cbbee4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These elements strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution, and the embedded JavaScript may facilitate this redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=candy+crush+saga+mod+apk+2020 PDF link annotation
    • http://dpsszczytno.pl/photo/file/xuxanenosutuwupaw.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/fokivelomitivovajiz.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/200353105.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/savavof.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/gizofeketoxakukalupak.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/9100382422.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/kimileguludavirix.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/b02384mgdljbipjsob6ms7d8tp/jifufutipijipur.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161372e7ebcfb7---92051512532.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/nifira.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_B7386FA2CD7F972A.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/18219631448.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/49678099095.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8a471056---lovizutidojutuxuvef.pdfIn PDF document text
    • http://4rrecycle.com/files/file/4874173767.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/27545201939.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fojuvip.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/fogorifodalelawupipedukof.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/niresupovaneri.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/537242554.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/76084419285.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/8216518408.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/54310251514.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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 11172 bytes
SHA-256: 6966e505c6604d5d5d30bf80a6b70d5400239f7fcd0e953203d51da760a134c7
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 17416 bytes
SHA-256: c68324b5dc15236db5e65c8e779c82fa50c0f56b88cd1c5b5c66fb760af3b3aa
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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