Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84cd28af4bd501a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 04:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5cb9b2619f251a44c3b6a081569ad505 SHA-1: 9266e1931db4c36ea580826a5210d98e02612a44 SHA-256: d84cd28af4bd501a3fb914520cf1ab4b7b6c025dc957f55579b1906fe7b45878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://villa-carlshorst.de/sites/default/files/file/naralirizu.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a1983298022a189c4ecf425c45c92673/lekokomafibuk.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65678980174.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/tirozigufan.pdfIn PDF document text
    • http://funperm.ru/content/file/4380719409.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/11941856120.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1862974b0b---gavifezezowamol.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5ded2d56---kabomoloka.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/40815832815.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/1084188834.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343eec10053---vikejojivavitusukowatof.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/87619781055.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/paxejax.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/57725972220.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/47328790546.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/57032811003.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/muposox.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rv7hern1okpfleohd6fiijiog0/10704040695.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee3ec6eaf---tiloba.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/mideruxofazaxopotosexewa.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sabelebugoxuj.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/tonoradobifixof.pdfIn PDF document text
    • http://lawngo.net/fckfiles/leraxebukazozeninifokav.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94218f76c---guvirogota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=scots+gaelic+grammar+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_off0000bd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2A 10932 bytes
SHA-256: d6b53174d6d835739583732e1a134b7510cabfbf7ac038ebb91f4fbebcdd5a6e
font_01_sfnt_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 17404 bytes
SHA-256: cb1c9cd7d7e693211a0ece3f30d62d602ace905ff1af88cbe0404271893cffb4
font_02_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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