Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa215047cf2b0581…

MALICIOUS

PDF

102.3 KB Created: 2021-10-14 22:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a795118b2729db8b3e8430d26758c0f SHA-1: 1804e881a31a223413f9756b49f22ba5b84c4380 SHA-256: aa215047cf2b0581f2e434fac454a5cd2e70dbab3920cd763bd40c5757af0ec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing lures, likely intended to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hardlineconstruct.ro/app/webroot/files/userfiles/files/fuvasejanivupojofumo.pdf In PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/71807164373.pdfIn PDF document text
    • http://uhorder.com/upload/files/lubop.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xadazimikux.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/tugegajevowemuxij.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/gewotidujereburi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/75340883905.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0kv55sng04mhujdfe546o7r2i0/26512769176.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/10466240081.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/famumivenuzusokoromaxi.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/14069534627.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/lasinegusetitidixulunebu.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/25632476466.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/14480128380.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/46413515458.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/wareguxavawu.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/1557534357.pdfIn PDF document text
    • http://getdol.com/page_data/file/42382409520.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161496afd33e7b---mapurizapuroropovep.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/80814890647.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/499583f084a031600d739f22371d2d2b/74110079458.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1616539705e160---dofexusupiv.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=reinsurance+solutions+intermediary+servicesPDF 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_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 10856 bytes
SHA-256: 9a490491559f1dc9283c3b248bbf1e3941eebbea48e8ea8a511fd8eaa2cbed33
font_01_sfnt_off00014204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14204 18720 bytes
SHA-256: e3818d392545ea242cc522d8921dc904312b83e8d76586384e8286f1212c9b86
font_02_sfnt_off000172f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1