Malicious PDF — malware analysis report

Static analysis result for SHA-256 964c6d8f76ea0534…

MALICIOUS

PDF

82.6 KB Created: 2021-08-16 23:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d13266aaf23c3cceab911ac8d3c66239 SHA-1: c81029db102552736dbd0ec2d7bac8c4e8b63987 SHA-256: 964c6d8f76ea05343485f0792d502435d3db42a67b33ca52002d8d9f8385194e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://kocarbon.vn/luutru/files/mezimi.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b141bd4d3c6---5336533694.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f0511883---94375419823.pdfIn PDF document text
    • https://unosms.us/userfiles/file/32538620228.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/mapibinelubasosowi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc64cc6f7b---dugegejewujesope.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/tuvojujuvinosovajetu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b733a91eee751cc35c2786b274daf9c9/86437620337.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/70612823476.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/57056568827.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/57306813666.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/69926775915.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210729/file/1627556984.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/jufifoj.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/damofaxerenobutozimelole.pdfIn PDF document text
    • https://businesslife.com/content/file/4185426698.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210626220536.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/add32f07b910f3af7f3865f0368c6900/20330536569.pdfIn PDF document text
    • http://alltechsro.cz/files/bigajifileni.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/jinikaniwolosamolezamom.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/18119914724.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/15fc7b8dccd4aec38a5aaa8ce92efc4b/95390181147.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a367ddad203---13607443213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+error+code+sc+mean+on+samsung+washerPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/goloduvefitesusig.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_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 16804 bytes
SHA-256: 42e14354fdee0c4bd50b35bb7b0ad2a8d01c2e019e3da6043db3f59273355ba2
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10856 bytes
SHA-256: 13e1c37580f2464985df995d34c2ab153a717f4c3318bff808b20af5b4be598f
font_02_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1