Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f56c6e83eb8c2b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 09:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f00ab2b7502b9079320426f582b06a70 SHA-1: b58c435d9fa5ebb540b2bc2741a0c9a2922034d4 SHA-256: c5f56c6e83eb8c2bf2a8bfb4e5f1fcf8072711979034133037a3add0f5d767e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the nature of the URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=jim+carrey+biography+pdf PDF link annotation
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hsu771l7bkfk22pi4frrfk524a/lejobesukidatet.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77b8dc92e---66652999420.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/86007838325.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/vixuvularamigenepuwiteg.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/guwigedapubusaronev.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ff211de28e6---bajamefujukomepera.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c6ea102812388d88d82cfe47aff1242a/33397499545.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6a6a6106---totadijudanerabopuwetixo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/xenow.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/98297826909.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/72532632837.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5d1fd4ebe1fcc74defdb9eb428d8cc78/tatatitufamawogigokuvure.pdfIn PDF document text
    • http://ibb-online.ru/f/file/rabizavigomejo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d99e05bed---85044201876.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/4531700694.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/43292855683.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/7168791870.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/wegubotujajavobavop.pdfIn PDF document text
    • http://araonline.hu/uploads/file/93905328439.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/95444092047.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/97292540760.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f85c6a48c99aaa1891fef0b03d2b3e93/jinoxuwuzopila.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//navujubimorosejudobefa.pdfIn PDF document text
    • 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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 10896 bytes
SHA-256: b5231f5abbc96769f184fe00ae2e3a32d89eed05236e3ed62e5b9b1119ddc137
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 18884 bytes
SHA-256: 716b81b4347f4bf4b4ff0078c8c3d973ee8f1fecb1a18e1bebdc1eca580d7dda
font_02_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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