Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbf604455dc9e2e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 14:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a00f3ae394614c2809cd4d8c7e9a0a5 SHA-1: ff1f5d88ef7d445164fff8bde1d9cd8fe5d72274 SHA-256: 4cbf604455dc9e2ed3f41417041e791f85854aaf7a7ead7fe08aad468bdc5ce6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, suggesting a phishing or malware distribution scheme. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=basic+english+grammar+structure+pdf PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beadf41c30b---5627919708.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdc2defb9---ledopusatopagumowu.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/76838074436.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ea375f0c---45827647873.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613153a21ed5a---mepofo.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/22849788036.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/64817981260.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/21933046019.pdfIn PDF document text
    • http://hodori247.com/uploads/files/soxotagonure.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160782892e5b9f---zigewazobitajerowadu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bas849iquqf7pkff88q17agq47/dekixarefozixuxovakotomox.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wapagivewojenidug.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fabuwimetenamejefumu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/37554743381.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/18442997469.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/31538950198.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe953122dc---nizozogurap.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/fedowomatofowogewire.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94e0b4876---vusozukubux.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/62889133770.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ffd2ba0d---kolewamuvazin.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210806203700.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_off0000bb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB65 11100 bytes
SHA-256: fd4f314af4fbb4e542eb4439dd06a338a2dbcf80477045523789448bc40d4705
font_01_sfnt_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 16276 bytes
SHA-256: cae850000d246c8b448a2a4cdf216708311efaaf1d1240ebd752f3129be7f9dd
font_02_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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