Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e0f9a39f931ec8…

MALICIOUS

PDF

83.6 KB Created: 2021-08-18 09:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e29715e651cb4f630a5201b924c5f17 SHA-1: 0dccaf581420000739faa2cad385616eba23f42a SHA-256: b6e0f9a39f931ec875af3e85b03a57cba997aa07e950779e5f7f3e7bd6def578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with lures like 'gta sa cheat codes app for android'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://laborke.ru/uplcv?utm_term=gta+sa+cheat+codes+app+for+android PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/61c05jk8nllb6l8c6rs6t0hl5c/zudosarovubitizokorus.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/kemowaja.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/t8g7de73dfmmqa2gf5jm2m610e/jupelujuxazewudo.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/18371382725.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/58435350128.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16097993a47cee---44155080202.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/99838414793.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7a71772ec1cc998b679f44133339a76f/taradavimiloluziwas.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e36543fda---99292252362.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/95800597208.pdfIn PDF document text
    • http://orthopediedelft.eu/files/lapewowokorijanazokij.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/kedibepixonuzoxovib.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/papoxobig.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/65678675028.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/fojonuzowitefedo.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zujit.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdf7a06bf---wenagizuseda.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/gatumudobof.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c93f2a11a28---bikitefupanu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8db61024---kewamujovawafekari.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zatisavedibeniva.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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 17120 bytes
SHA-256: 0dc9c6dad45f8bc82c5ddc6dda2f661d60a3d3c319dcd99e4933d9e631b4fdaf
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 10712 bytes
SHA-256: a0039fd90063673f06571b7db02e9f217163194c5232a8a83125873f31d8fd2c

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