Malicious PDF — malware analysis report

Static analysis result for SHA-256 df03447ff54ac77a…

MALICIOUS

PDF

95.9 KB Created: 2021-06-30 21:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5b3cd802e3ac8d0a92cecbc5eb4180c4 SHA-1: d8190e2d817e0f62397331529b1fbc90fd2fc89a SHA-256: df03447ff54ac77a81e20b3946a4c4c8c1f563b97f1d9a80a2bf9daae64244a6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8d7d863f---tenenozodososam.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f1add51e---rizewonebufanuzowezumofag.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/85363100732.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/85a7530e7dc08e8973a15b97101e4afb/21651472786.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81cc4a2565084912c4eb909abe94824e/88331801553.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7a29ac21---31468025482.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/82648740793.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/79654045928.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afce359e8a---6810624997.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/22926598471.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/soxewugoze.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/35992637571.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1081d195---67608918720.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901bf4632a7---xumunarevexi.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb96b6f658---wamajitewetibasowiked.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a96bec73d---rejomi.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/kugevuro.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ea36892b---17079227236.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1917a26def1987e5e5758f0ed3d9a9e3/xuwujopuzafivegezigujos.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n0r1na4p67lm7qveqlh9n1m5bi/zefaposapawalowiviz.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/beguzevekutafunabapokalu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc2352ec8---64988243535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=servomechanism+in+aircraftPDF 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_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10696 bytes
SHA-256: 85ab067993fe072e49571247e09a26e5b73a53b9bcad83bcff7be157a6fd0687
font_01_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 17548 bytes
SHA-256: 3b86cd221ba3624926d72b74438cf4cc28400d12d102daf8168f7f412e2e5747

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