Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a87dd21206528…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 09:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9e4a03d33c1fe9f3b38ba0934229c0a SHA-1: 679949225ce99f433dbf78ef3efb6e35e171b27f SHA-256: 404a87dd2120652838a53dc9ce9f87101db501ed5834ee5fa62028f2737614dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a T1566.001 (Spearphishing Attachment) attack pattern. No scripts were extracted from this sample, but the presence of numerous external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=at+stake+meaning PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088008e3283d---26678989921.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/64945942433.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/44596398744.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/9sca9c72j05ia91c61vbjb102j/dajemaz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6008cf27b177b9295749b7261a63c9cb/lawatajureguv.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/2555360002.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608008177b9b5---mesulexegibokojawepa.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tiposejawivewolufite.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/75d7bbace201c53e450b7952e34efee4/93889579527.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zegupub.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cb271714---68482980290.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/0a14698781e86f41e2832ac8dc3abfcf/97973838209.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/rijaxutozulepok.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ecff7d9c2c84a8b5b525fc9b73f78a90/wewefotifakapume.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wutebumul.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/88548478611.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nisabasa.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/besudevijimovoviva.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7744fb68b2---pesipimawiwugakavogin.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/93153650959.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/44319539718baacbfd6fc12d5ca94f53/sakunawevivixatalawali.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fa28a6c915903d568c383d3368705438/17778506075.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf77b2a30a---nivolufapevigobetor.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039b7a9f6---32031636079.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nesilawasakujexipugi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 3032 bytes
SHA-256: 409d968c2855e6e342e428d51361eb493770453b9f1e03f954b673f410a051ce
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 10260 bytes
SHA-256: 88f3d3d9a582eab9b73c14e7ff2eae227ae6f76bd1c621d822b5f0a3750c6008
font_03_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 17060 bytes
SHA-256: ec7a44196821d113ccd8cdab53a7ff0e066af45d5d4f7b8663be511d45126081
font_04_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 20956 bytes
SHA-256: 8731978602afaa1b1c2a2ac776673f604e324c170e41e3d58643ce109fd9d246

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