Malicious PDF — malware analysis report

Static analysis result for SHA-256 c683b6463b932d5b…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 11:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c77093c788bca532138119a4d9d8ded2 SHA-1: 77fc0824cc15d462fd5c81bcdb55c03fa537e3bf SHA-256: c683b6463b932d5bafa541d70c7115cd77abd063444a2e8a160f5f8b1c949b44
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a link farm designed to host or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://jrmhandling.nl/upload/file/49346233948.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43277d29a2---turipifipebakoxemavixaru.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d9abc4ee0b8b978de17043b6110f40e5/91488979028.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d356203895---jenupiduzotix.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/binisamuludok.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ecq58fj8n3qa14si32461i4plh/rujizuwupaxo.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/fozosesesitabunex.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a264d21d964---xizuxasodenevigagoja.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/tobeduzivopuxejimumozon.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/kasonuti.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/49159e57c45bbfcba80d523f6b641191/tilexuvuregiwesivemesiw.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/saxodagopedol.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef11ee660a---61713622142.pdfIn PDF document text
    • http://arablift.net/userfiles/file/12053637087.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f14121cda49f3c50ebd2ba7f7d78a41f/lurafamagonerifitabozibu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ad96e7b6a15f9bdc2608a21dbcfb8eac/pawowapolu.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zigejusizonuzutajono.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nidakivo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c50dd3ef73ed752dee16b1161e1d19e7/fezuwovomipe.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/3583430571.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ds0e68ggtfgkjceejlrs9gmksn/migidij.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/filipexuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+water+slime+without+glue+borax+and+cornstarchPDF 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_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 11328 bytes
SHA-256: efc439fe1509e709361b36c06517b13c651d38d0d758f323d9ede8e49e4df520
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16668 bytes
SHA-256: e7a7bbcef9670a499eb546ca19de5ecfef18e279cbaea0ca7508a6c034ca4010

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