Malicious PDF — malware analysis report

Static analysis result for SHA-256 06906f0bfc1258ba…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 19:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9670d9fb98092dc3f34e210860d00f1c SHA-1: 13f462a10de8db649aa8c1de0484c69fc17f2cb0 SHA-256: 06906f0bfc1258ba7006a975c8403cca0d690b550834e58fb6ec37c2d1921332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. The presence of multiple external URI heuristics further supports the malicious intent of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://crewmak.ru/uplcv?utm_term=vidmate+app+free+download+for+android+mobile+old+version PDF link annotation
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/23386945659.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/53620736968.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/mowevamafijopisig.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/povimugekexenuf.pdfIn PDF document text
    • http://julianina.dk/upload/file/40179192696.pdfIn PDF document text
    • https://hirurgija.me/files/xunifolawipelewak.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/de7fccb8dfkq1f1rptpjctp0uh/64332096467.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xosigimotigukomipefogaj.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/2877241096.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/guxigukegesejobujowuleti.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/sugafejibufupe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d5e8dd87---40149144792.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/2368951188.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338da91e2c4---fowowetowivoviximabemu.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/jinawupitibin.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/pirukibosu.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/gigixezeduputuravoxewug.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/29925092499.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/46149106900.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109222125041473.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/fufazil.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/lilezaxivitu.pdfIn PDF document text
    • http://capital96.com/userfiles/file/66118985544.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351494d2f05.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_off0000af14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 10920 bytes
SHA-256: 23a26a7e0a8ea27d09173b7aacf5e6bcb7fa0ebdf27865eec4a3e5982d25bbb0
font_02_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 14852 bytes
SHA-256: 7e08046b7017bbd36990ed33810b316d2c9721f49ebe95cc85897b4e01b77526