Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cfdf054a7f57e7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 13:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff69cde4b836ca14c27e28c9a50a3d5b SHA-1: c6f1899c09ff86bac839d1f321b17026ff494bff SHA-256: 59cfdf054a7f57e788e5d993b20ea691e793d5898c5d9edef6590b4c2e64680e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate it points to external PDFs hosted on compromised CMS uploads, suggesting an attempt to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://solucionaesp.com/ckfinder/userfiles/files/ravilit.pdf In PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4db21e960227fb9c9acd786ea82ac1f5/koxizuzofagubafanejoxo.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pegetiwo.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/26292862877.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/u358m5l7men3s7a5r791s9rf37/65605881156.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b8e96ee5---vabiwotavevosazevutuko.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086abbec66---pitupalefaru.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0bce7d0b3a337ec2448be1b76fa56176/46531016400.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/jimerazuwenowodagudedivez.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f116de6ad8e8ed93aa4b322112128255/febujozusoxatabamojowevo.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/zitesubojef.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee00ca686---26796459334.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad59370765---31332895277.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/37575042386.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/71670113653.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sexalatef.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8014af6e---mewuneluxuvubinuragabusu.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/36173534141.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210714131213_h79699.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/4948072582.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c348eda20c901709df53a5b34361d318/75578081158.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/rubaxerexegati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=purgatorio+canto+1+parafrasi+pdfPDF 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_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 10768 bytes
SHA-256: d7353ca2f231ec36bd7a9e39801c8ebf8e4062d79e4350296600c2ee6a4eedd0
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 17864 bytes
SHA-256: d2c6ebb7b6d8885a390e7003bb5f14f7d93e06b9fc30740ec3df920e80078eaa
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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