Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85a004cf7c155c1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 04:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93a9e2983c8fdb9b6630cc4dcc29c339 SHA-1: c38744569fcd8688c67950da89be584999a3a539 SHA-256: d85a004cf7c155c1ec5bf8b78848a4f330eada9859b496ae94e2364117697ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=chemistry+class+12th+notes+pdf PDF link annotation
    • https://tortugafilms.ca/adminfiles/file/71580877078.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/76958119139.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/83006591408.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/80948668709.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/78428289316.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/muxibabosiverenekagerabe.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/zivefefafutenovuvuj.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lbbv3rdvadhrjdppve0cdpumtq/xenufera.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb213c811b2---liges.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4129940c---befufujigakebivasakup.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/10845396312.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e822npjblqu1cre1dvm3p0bgj2/jetezobebekaxudu.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/kogewutuxutanu.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/kezubobum.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7b7808d99118de252450859bb291bd3f/pibuleju.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2dbd6461---86913237252.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86af2d3ce---sutulaf.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b18365fbb---wizipojenogejutox.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/12580848777.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/11662510932.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/52b21bac68b55e5c175d0c242fb7294b/42403871110.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/646045936.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ea9d9908effb01a8ec307990dc3360c8/82561768678.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_off0000be57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 11200 bytes
SHA-256: dff2aa7c4a7e3a99967c76091732aa8bcd56d88aab6ef3bcc2949ad2f9c8f267
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16404 bytes
SHA-256: a963703baebcb3622fcf3662c7f9bfd74a30f928a4b7ad86743a9cbf00370e44
font_02_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.