Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ea89702f235a44…

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 19:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 17a05eab5bb253573744591f5e340012 SHA-1: 31b231e7f11510b1580f0875bc0d4881eef997fc SHA-256: 65ea89702f235a446eefbd376273b372aa63c5a419b2c2afc24899fbb7751879
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting. The primary purpose appears to be to lure users into clicking these links, likely leading to further exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8b4a78d5---12555581992.pdf In PDF document text
    • https://underworldgear.com/upload/users/files/zuworideravuvesowezez.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/newivafilu.pdfIn PDF document text
    • http://armanetti.com/images/zigonefavesiteguwewesun.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/2df13a81c9e5d46704bd75aaf4f98287/61373829304.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/pojuza.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55be240a2---4521969107.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/86611448447.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ae8ba4b2---11602002945.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/29527839121.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/ffd8fb6cb0b0f0956392d7f2752117bc/tixufules.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89da67b52---voralakaxazaxomete.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/dukolonalej.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088234803861---9280381862.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/detomusumoviw.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/vudeledajotitimapasejaz.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/32cdcca60597655fc8db904bfc19334e/48090830620.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d140affkkn4bf6p7foq7ekrs14/71231876608.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbababacbee---momoxirogububi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/rccifid05np2pjagaabhabubg4/sevudewenijevurav.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d532e89ba---wutikiritefoger.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3aa4768ea---bufowifuxukuxopaxek.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/56042055589.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/21302843096.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/1740921514.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b10204ad669---niwoxevidutolariwosuralim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=theo+james+and+kate+winsletPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 26744 bytes
SHA-256: 1aa0d8650a75c54cf040d37f5293f17eab845fa7e918f43702eeef75853de7da
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 10684 bytes
SHA-256: 78c50fed9273a803888124313814a19b13f21d30f979bf8411efe42f0bc472b3