Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf90cbb77263157…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 08:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9192e30f8aa11d24f6cd5652a00139ae SHA-1: 0ff1ace3efa8b9b8da554dc15f564014417b5fad SHA-256: dcf90cbb7726315752b2d419eb37d6f46c0a97e1a47ae5b3cd62db61997544bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and link farms strongly suggests a malicious intent, likely to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=cause+of+cold+sores PDF link annotation
    • http://miroslaws.com/ckfinder/userfiles/files/dulepuje.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/58643661487.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/12063530805.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/30111480995d1cfe8186f0e8e0e6b016/soluvafuxusowuko.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/dowamu.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/xidelebazimunopodenonug.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vqas60ht460pm4o67ue3rgh2l1/japizazotep.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbee4aa58---5750478301.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e437b6e78---bimelunuvex.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4llg1fu3cn3lcrkrak7ol076m3/fumipepilonupexuzopuwagu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077364bd2d4f---60946319586.pdfIn PDF document text
    • http://primaneighbors.com/userimages/daxumalutiwuge.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/913db43d8779299d762fe7620ce4e4bb/xabelenebazegizomoriwi.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/82242317478.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfe5f62e44---83610233364.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/39387439720.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210705104502.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/86688672780.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/35639012657.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/aglgucr232e572d7sqrlc6fj2f/famuredizajewunuzase.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/xusikofejojolanowevido.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/34202590737.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66b6ebcb1---91939684405.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/aff7ca87231785cd679da353f4aa4beb/29445200883.pdfIn PDF document text
    • 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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 10304 bytes
SHA-256: 26c0c19eb788b7e06a098f13a68aae9dd2280bec59f48bbb8e0c0438d327bd5a
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 17348 bytes
SHA-256: 34a8b852ee2e9772b2a8fcd1578582029702a31d98f5642d677f078f81330f2e
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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