Malicious PDF — malware analysis report

Static analysis result for SHA-256 82eeed3376056b56…

MALICIOUS

PDF

90.5 KB Created: 2021-08-13 09:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b232191ceef8987a0c401601b7d6c7d0 SHA-1: 3726c9e055ff00d4a287cfa121a5ee84587ee3e4 SHA-256: 82eeed3376056b56b4251e76d7b213f1e1d083917b56020919ac7032eac5c798
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, indicating its purpose is to redirect users to potentially malicious websites. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware downloads. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=principio+de+cuantizaci%C3%B3n+de+la+luz+pdf PDF link annotation
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2c18b1e097660e02751f13d689a07627/ruzedumamimetopuzemeponop.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/69395569013.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef5cd1d0c421d3c4026a32a814cffb18/44403283676.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9d6ba3eff4f99327f2ee7bdedd48006e/venamukapisiguz.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c475fa4d574---40733185682.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/jaworozifekuro.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/1284110307.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/9842902279.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93603116359.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/88152237229.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/68527gpfachljbb7g2na06qj5i/wojaduk.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/q3p0o5n53hi5hvqoplic0p64t3/95599861970.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9ecc42485d375acb541c1768cf8bed6d/xurofozepafodufe.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fawufidevukib.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/bijepusa.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mlsn0pmgtvsg3vsg5cn1s37aji/91802807270.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c64e824d6b6---fusafufifagekimug.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/zubofazevatatufif.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb6415e0d---virakufexadu.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/nizekekozinilewunid.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97b1491400---42307527430.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c1ab005a---vuxajelazoxekusa.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/forifidupukenida.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 18596 bytes
SHA-256: 121a6581ef5d35003608d41f0a9db681fc5439b262f7dda1fb5c730bd4d023fa
font_02_sfnt_off000140e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E8 10744 bytes
SHA-256: 830a84017e71a5b2cde2f2658288da312737de491e3770bff8a45f3aff6e5d78

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