Malicious PDF — malware analysis report

Static analysis result for SHA-256 533959040f2ac13c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 12:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05f9cd5fc15719d0c239de4af176aaeb SHA-1: 56433d3c76f7fa8a3282f4d05aeabce3cecc8a9e SHA-256: 533959040f2ac13c6dc60a8a22840c366c216ee2537d009d205107d150497215
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://everywheregenes.com/uploadfile/qu26_qu106_com/files/rufegi.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/875374e3809e0fdb9bba4449f6f649f4/rirolovoxo.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/zalojowexadev.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0fc5748d7---dejopebadikixe.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/lumizinobipuwel.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/18123882595.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081115290e3b---78741390550.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/24374174548.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7328dae6a---kapakotewedozip.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac477e424---pujuvoliwupuvupumulo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4533988d---xesufuwikowamilifofub.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e16b49e02---xerebevajolosiwu.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/19553839199.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/lopalazuwulu.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12001085541.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/zozuvekawa.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16255422374658.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/66376652948.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070cea48392a---24068436469.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6826368d50e9f928e33a805b4aa1fead/wosuximefavometuna.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/nakavodisisevanis.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/dunewefuludusidejit.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/xosobinadexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=stratenwerth+derecho+penal+parte+general+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_off0000b91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 10800 bytes
SHA-256: e2d169cb8d5fa6ec00353fb6f1eefd2400d8d8e6d7201953f105f7302b7fe137
font_02_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 17968 bytes
SHA-256: d619d58fab5f92013d897678819314563fd9c589697eb1cae45cb44d554edfa8

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