Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c39964265b6d22…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 00:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 745b2f097dc05d1484307200c0a7b210 SHA-1: 8fb6c24a45f68617c0303213f19864893a167587 SHA-256: 90c39964265b6d223aa1a696dbf7ba6c7c57d7626b0214a1ae60d51d45c464c7
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and points to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=the+rainmaker+movie+script+pdf
    • http://cascad-trans.ru/files/lurukavamawukubavu.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7cee5286701ae144015942e713fdb8ea/24909886497.pdf
    • http://meskerjager.nl/media/files/wuvajewati.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9b823da4f---24043604957.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e318932c---87493793049.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b3f72616---vebisemasajudewaf.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xomabuwimemizom.pdf
    • http://centralcogtc.com/uploads/file/21199245359.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9e3508eb---zukema.pdf
    • http://yokohama-model.com/userfiles/files/16116719981.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/40n17gadhgjgtnbuiti0uvpd7g/miritafi.pdf
    • http://koala-al.com/d/files/lefuxiwigunere.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5755e8da---26563289029.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tadivalegujibo.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2273c70aa0596247011a901ea9da03da/34802206475.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/kafigid.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/dfa4d3b8fd57b4992c9e3b69864638ca/14569624243.pdf
    • https://ctsgroups.asia/images/file/50762968428.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5iioi8vcv5635d55g0hic8b745/lozotenulav.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a240ef2de3---mefegixigiwogodotez.pdf
    • http://ganteltechnology.com/system/userfiles/file/rijema.pdf
    • http://saxonrt.hu/img/userfiles/files/85627509411.pdf
    • http://timecraftz.com/userfiles/file/32301987802.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210829052219.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ea.bin
52102345ede0822484de1b5bd1a4992331242efca40ceb4eafbe5da00d4c8164
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EA 10960 bytes
font_01_sfnt_off0000d23a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16792 bytes
font_02_sfnt_off0000ea4c.bin
ace5f4c33d2cc6dd49f5a8386a505e57937f59e4d706cb8fa3470ca5dd2adb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 16528 bytes