Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb5c731f69800f0…

MALICIOUS

PDF

83.2 KB Created: 2021-08-18 15:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9fac86b01cda9b00a35263fafb782601 SHA-1: 00f85c0532bc6393405f3e9c76633c967a1f31e3 SHA-256: bbb5c731f69800f01d92ce17635b97e802d36298861694c3aba858b621df6070
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and trojan activity. The presence of embedded JavaScript, a link farm pointing to compromised CMS uploads, and explicit lures for password-protected archives and callback phishing suggest a multi-stage attack. The document likely aims to trick users into downloading a password-protected payload, possibly to evade gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://apotekatia.ba/fajlovi/rukatike.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f643210a18---43827629164.pdfIn PDF document text
    • http://terrietanaka.com/library/files/tosowukedunumusamoxaz.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/goqonlaedvo2amgeljptkp87e3/95709214061.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/takonug.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/31375717832.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/76471499895.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/91272831309.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kojoxafetosuwuxisomo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621050625674723826.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890a2dd9971---defileziki.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/daf3bda5ab77c0350c0ea8fa190a0057/jeduliviperaxok.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944b294eabd---zolipatazafijukepebomot.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kumevexi.pdfIn PDF document text
    • http://aqcons.vn/upload/files/88740121479.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/lovidunolatizexemutunir.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/83935537983.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/90873207674.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/xemanojawunug.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c531c5b5884---vasarowefulafumirabilobok.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/39918738670.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/burilore.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/59910456410.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/64203701664.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31f7697c9---pamomuduzonaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+hdfc+bank+statement+pdf+passwordPDF 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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 17528 bytes
SHA-256: 6f01d2f22151e5ed04bb71935cfdc919f988c505ef9f646b6d87760f38f3e207
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 11152 bytes
SHA-256: c71a7dd7118fd0b89548cf9001a5fd250a21ff3cca1c8da6fe169b4fad6bf7ce

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