Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93516ab5cbdcdff…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45fc600b46afea7b5613fc8e2e6697b1 SHA-1: 655584368454041061163948a77a355151bff576 SHA-256: a93516ab5cbdcdff02cb921de4c37054725e560d1d8407c0f13ec4bdf41e4e5c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://sunnysolutions.it/uploads/assets/file/10628253166.pdf In PDF document text
    • http://montoaneli.com/ckfinder/files/vukulejaw.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/motavedajaviz.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/n2ktcphtv2gip670pu1bmiqvii/borofowetegetudu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9qvtdgr5503g1qvn8s5h5q4mqo/91055099662.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/xivuxexav.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613626566401f---94493986563.pdfIn PDF document text
    • https://mkontakt.com/dat/file/4868953935.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/gobafatuzorarenuporetowu.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/papev.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/gonivi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/81708621982.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131916c62e8a---moxuzenawono.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/guxirisutisiwowufomasa.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/74913994493.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/dajidow.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/73311481158.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/69190371449.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/66285641007.pdfIn PDF document text
    • http://lblussana.it/images/file/devumenipi.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/nanesorekozosotanup.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140298fac9c1---todajalubidutodisubox.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/zavukapirotajoxeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+pocket+edition+full+apkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_02_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10628 bytes
SHA-256: 1172d939e6d37422a7fec8bf1f301a3e6d545327f08971ab843b8dc87a70603f
font_03_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 21728 bytes
SHA-256: 2212a740ed254088254a1e84f5e5786bef891b86c97213b5c99e82fafc6581e9

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