Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b15b0ee0afd1389…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 09:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba99ca1e2bb1f7ea150421a866eeb3e4 SHA-1: 0666aeb8c85cbfd7e4c5656f150e8ea0d6efb126 SHA-256: 6b15b0ee0afd13890118c37522f0b4991f25e4d0224ca342ff689a24ec2c516f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=android+processor+types PDF link annotation
    • http://mrtowing.ca/Lawyers/userfiles/file/tozirufoginevokanu.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/kedoxutemamezopemovubeson.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/18799545976.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/4675225993.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/82759013067.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bbb5886313305faa15ca5f84102f27d2/20094488756.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417472a31b4---fuvasazorenapesimarajijog.pdfIn PDF document text
    • http://asfalon.com/__files/file/lotadefesikafage.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/vobuserabezejijasifuwubo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414ceb48ce3---43006128421.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/97265209561.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac23c5f19c---77468098838.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6335f6756228579a6b1ebfea484a426a/visunizedepabuparapami.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2ac2ccbc329777a7da394aa3aea12a1b/mibutujowaxuwut.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/52128841759.pdfIn PDF document text
    • http://land89.com/ckupload/files/weminibepo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613335dd5417e---40362433659.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dokoratetamatovifijowig.pdfIn PDF document text
    • http://lg-palette.com/upload/files/20490623799.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/17352334996.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614161fbbe985---22587641720.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/73585475896.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/67001074931.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/39973236816.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/68049451436.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 18480 bytes
SHA-256: 7ff110606399a8a03b95c687be344a2c24fed25483ba44a39deabc4d1386dbe0
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10396 bytes
SHA-256: 23038bf407b302f0002256bc76595d5d1541b0cb23dec1a327cf40b172039a40
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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