Malicious PDF — malware analysis report

Static analysis result for SHA-256 2302b3543632a260…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 21:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1da58920172e72f53213c0c4b93681d6 SHA-1: ed82ae7be91749c45ffdd3765d1bb2332ab9a96f SHA-256: 2302b3543632a260a775b1fca053c980c491aaae34716864074e4c817ba341f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=pdf+to+word+converter+zamzar+online PDF link annotation
    • http://floral-design-lindgens.de/userfiles/file/88219975206.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/84b77a76cfd8befbc476692ba554b656/28444381979.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712cd662494---71768393935.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210619200031_le1mae.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/31183623215.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jidalebuxoda.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/84073850222.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108340fb981f---65779415558.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c49d58497274dfb402eefeb9183e9c75/62216416600.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/jedigipojitigumasafu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/76545472552.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/51493109154.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mavipe.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/35923960598.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/70450313455.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/66743721262.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/22600004899.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/6904011668.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5esr4kddi6gk0bru61bc1ghndp/86961432107.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/72364213935.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b07fa4c5659f796dd7f0fc131eb94394/vakosam.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/78797398823.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c6f52802d49dc184221f02226c1b5830/wegevipifudikipifivemozot.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210610_D0F8C89AC3FF73D7.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_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 17580 bytes
SHA-256: 65d931c1f2a2327b9b0623e8a792f7429ec3f9101bf99d4a2a0d5f2543bf94c1
font_02_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 10684 bytes
SHA-256: 9b23e3ec6658851eb4f647ee14fd500cf4df463f3cfd18fb66ca7a814c71442c

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