Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff0e389f1fadb38…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 07:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 208d6e40b1293ac023cb2d1bc0f0d3ae SHA-1: d09b0d8f1227478c7be75fba7cc237902299038b SHA-256: 7ff0e389f1fadb38fa3d8638d20164d4fb359ce6039c8fc8e2704840563cf417
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 CMS upload storage or disposable hosting. These links form a link farm, suggesting the document's primary purpose is to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://crysiq.ru/uplcv?utm_term=the+conjuring+watch+now PDF link annotation
    • http://rilta.net/userfiles/files/68239069837.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/zomuradezepizojesojozi.pdfIn PDF document text
    • http://plncse.hu/php_data/file/59173642992.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/78938548794.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ba6dc32d8---kevodesibisokukinuvolunog.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/kovopodutakuwefurodupixev.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c3fc9a6fd---51093081847.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/jefinoxamimumulavizaz.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/492293dfce34d84fc8a66f94010b55d0/rolitamemexevipavonedunuw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/16887163255.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/41583465621.pdfIn PDF document text
    • http://krokodilok.hu/_user/file/73346006867.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/efd8b1675331d426be2c98e5522f7e0e/xivisegatuje.pdfIn PDF document text
    • http://gaudi.tw/upload/files/36696467526.pdfIn PDF document text
    • https://stotex.rs/files/15834655697.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/nidofilerugalore.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/fadezafufejotewupi.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/kazonoxazupapafezaxezeziv.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/satibiragavobido.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/34276335177.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/xuwuxipatidagasiwor.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/bowirawe.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_off0000add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 15220 bytes
SHA-256: 3652be290f8aa996aa13f6226dd8fc7544fb9c065db6f6343a205c1ba346b100
font_01_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 10576 bytes
SHA-256: f6d5c81cd8c16dda59b1757aaa99dfa41cced889c1385f8cd860545e0b2fee06
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1