Malicious PDF — malware analysis report

Static analysis result for SHA-256 2219f85486f45567…

MALICIOUS

PDF

74.3 KB Created: 2021-08-28 02:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d71e07528f340577ba360f871f7700f6 SHA-1: f4fa61cb5fbb386cbc2f062903363007e7ca69e3 SHA-256: 2219f85486f45567459bf54154148c347c0b4d3e988cf633a0a311f26cc66b51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a large number of links, likely to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=best+pdf+viewer+for+android PDF link annotation
    • http://labsshop.com/d/files/fawotupanawanego.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g0gsj8ibr6j49rmqr0gejui7p5/38626875285.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/87ac3f9e23811874925e2ce3ab16612a/19835182806.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/segexogivurivipipilutaf.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63488851748.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/sq026ujc4b7grqf0b98itp3nps/sefuduwekuwaruledobopof.pdfIn PDF document text
    • http://waypl.pl/upload/File/19515054311.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zimuvat.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6qjvbhf0lnerntorheju8h7can/29168790069.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/11056928488.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/suvaxisef.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a825d956f---51562932561.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/64780826234.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/70344781475.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ca67cede---mutukexewuxumofir.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c396cdb9257383d2e127142fb39f29b8/15863820659.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/rotixedokuweromu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/t1ufck7nu24mge0chl7pca5227/99817082374.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/90005908952.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/46913699583.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f730858fce8---11468787881.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/47cebb6f164e18d9fc5aa4b19adf43c6/10825283805.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/1548960547.pdfIn PDF document text
    • http://spain-ex.com/images/blog//file/91554528348.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d60cdada0f3---39041254198.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_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 16044 bytes
SHA-256: 6e9217079597588d6e91cac12db5173f05fce48d4b32716f368a19e3c9421fe7
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 10652 bytes
SHA-256: 0f83daa33e02159475d92799597e2272230cccc2ba7c409149d19c79a5a61b64
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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