Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7d7146dac179c8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 22:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93c99472e04bed4be438ac25983a6808 SHA-1: 3a2c90b1dab8e5a95f2b68073472a0955a0b34b5 SHA-256: fc7d7146dac179c8c831a54cf534007ad12ce03ee2599af6cbf202156e8dccd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classification and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/vesalibig.pdf In PDF document text
    • http://rapet.hu/files/degugipasiwivo.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/37671373807.pdfIn PDF document text
    • https://gdaniec.com/upload/files/8885591012.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/10015634559.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/zawofo.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/4833685885.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/94158102703.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/xalikede.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/jozoxobovuvododifabu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2ea58fb7f45dd7871cd1c2ab4126dc58/zibed.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/nujukevuxilazopazonaf.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/55875825576.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lerugimo.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/povemopanukatenapexaximar.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/sodori.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vorutanugigipadukutoru.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8969947c---guxavogokazen.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/81355711666.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/begufa.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/limuwatumolezoje.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/41998751809.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c598a40a3b---kemuneme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=magisk+android+11+updatePDF 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_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 10756 bytes
SHA-256: 130c4c9575ef8cd731e9b2f4dbf2407ebc3444c3a9ad532d94162bcbfd91ad68
font_02_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 17808 bytes
SHA-256: 3a869005b631210c71c14d54893618cb2230d8ad817a2054997ae85a89415e9a

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