Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aea972e53160e5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 01:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30bb0cb429ffeec383bb1e4abc5ac5e8 SHA-1: a7f72986e88fdfa966d309075d209a093005df17 SHA-256: 17aea972e53160e5f7a47fbca6beee9c3b22a05bcb8ac77c3e55a9fd777b0b5c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The file's structure and the nature of the URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://adepotcustom.com/UploadFiles/file/20210627190437155.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/b1bi1rpi90cn3h1i0hl3qcgu5t/wudizadoweju.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4472534fdd---70390634332.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a158c9ae---56161803629.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/silorofifivenorexibusoziw.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/18105341080.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a14cc004c8ba42460a89121b7065170a/degavo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daba737bb3---vobidologi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/59817563489.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/96481288524.pdfIn PDF document text
    • http://debten.net/UserFiles/File/tanof.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/74502531053.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rigetazagotimofawojala.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9024c7f58fd834b459a2d62884ed840f/62640733746.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3d11ec5a9f13779666125b24725f2468/16163732150.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd156b3afc---72506090797.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/64653249416.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/36319808615.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/09dfb005e5df719b13e6010481eab41a/43257581687.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/buvaxox.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/002e587a5507efc1479cd3e1cd2ce830/26597563096.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/97523273576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=conversion+of+pdf+file+to+microsoft+wordPDF 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_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 17824 bytes
SHA-256: 94c81c82a7c0660dbebe43614e63bdfa0c7501585d274938e726f7643c7789ef
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 10804 bytes
SHA-256: d93cfc3fee8520c9b96bd6f44c18f2d7f6093a846b289d0aeb1946578c428560
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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