Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05026f7761cac12…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 09:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fca8685c88603186161d5f2ad57d4625 SHA-1: 2c3376352aab31bc61ef15a0a7b0f58d505741f5 SHA-256: c05026f7761cac12d506dc8a04b0253c8de3cf3418b04187fdf68f3e5ce427c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable domains or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://coretry.ru/uplcv?utm_term=how+to+stream+from+phone+to+tv+with+chromecast PDF link annotation
    • http://alexdisinfestazioni.com/userfiles/files/98471304827.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/49157629278.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/zomexasazixof.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c80c6601bbd709cd75f4acfbc425022/76827010626.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090504042979.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/tiwom.pdfIn PDF document text
    • http://yongqingtech.com/d/files/saximimosovuzikim.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/lilukefojazonowazibifex.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/xirojatoge.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349722555d1---foletatibubokewuzawotaba.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/boviposef.pdfIn PDF document text
    • https://polandpools.com/contents/files/42625790892.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/nagibitafiwopafabiwones.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/wapemuvafotojuziwisu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/trbbf1kjes2q7p71ljshde0ton/vikefabuxe.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/wuxidisedu.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/refokatixikejenewu.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/xedudiwutuzo.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/28698953703.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/43724316139.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jafume.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/73953289941.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/32672303738.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_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 17180 bytes
SHA-256: d7498d55a52ffd41906264ee69c2a307e7e31d6d1154f5d310d72075038300b5
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10844 bytes
SHA-256: 2100d01297110320fcf1f6d91dbebdcdc707a6a0d1bdaf367e64a7e5dcab1fe5
font_02_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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