Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0c1e871ec5064a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 11:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 948fcbc86751c4d7c7f80cb26d692af4 SHA-1: 63bc557e09139081465482ba279b4127ffee647d SHA-256: 4c0c1e871ec5064ac7727ca557c2cbe64ed049e06f09cc362498951447d848e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF is designed to host numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=minecraft+skyblock+seed+xbox+one', likely serve as lures to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=minecraft+skyblock+seed+xbox+one PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb69baff78---lexofofo.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/josajizebidal.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/12771312009.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mobuzupow.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091002152062.pdfIn PDF document text
    • http://gojjang.com/uploads/files/kujolatezolinatojalezoto.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/ruwupisitoworowulipew.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/vovelofegisavikuviraxad.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40750f1ed---gomex.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/nisawep.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/30578114372.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3b05baba---7706899856.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/60317716663.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/81613454278.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/32731312322.pdfIn PDF document text
    • http://leguido.net/files/nobanawasadebuxolarufe.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/dowufitifeg.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/42362043924.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/83039604856.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05d990f93---mabijixogibesomivazaxuw.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b13901a90---42548970407.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/10556688331.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/42435445464.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b255b06497---nawiwipuxulapewati.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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 17520 bytes
SHA-256: cf09d38bfb2870031e13a2ce549b6c07565c82be76b46b5c6d8c1f3ca273ed17
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10908 bytes
SHA-256: 44b9371b9a0d7a2737751c8bb1cf4d0c1cc0bb78dbab7ba2773109e2c40510f1
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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