Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a19fba66355f1ba…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 05:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a84bedc78434e6d95d39f0304a5f995c SHA-1: a943f55514b491ca65830dd319af4d79eafdb52a SHA-256: 6a19fba66355f1ba6020027f1eb0be63e09260c9a8659fdc74669fb41e8d88be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting. The heuristic firings indicate it functions as a link farm, likely designed to redirect users to phishing sites or download further malicious content. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=hypoglycemia+value+in+adults PDF link annotation
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/73308104618.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/39f0d03d30cc2266d8f3f83be3809c45/xinune.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/69048638665.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/80060980475.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5d945dgd5mfjj6h0n78dejg7g2/55191954211.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c0fe24f1cc2e603ae882036df5273dc0/retusuvub.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/85891721696.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/568c4c6bd2ba4b7482b6a23fcc084531/zalavozenol.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607029e7c4ab3---35291051067.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xagovojepupixe.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13db891de---31582821408.pdfIn PDF document text
    • https://x-software.cz/data/file/vixopikerugewewamegemu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ea3f2eaa---96403518876.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/dc8647cf0c3a4393c629be5574709c0e/gujifapapobepefufobebumot.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/g0mk34ik3i26mtkva3h580sg92/87778622821.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd43e806a09d4de1d6b9bd00c944e922/begalazukeruluke.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b44e6ba02d1---86290499826.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b44354f35a3---33575119979.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088988283615---19002257123.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbdc3a798f---24021599215.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160986fff72c4b---niwemizekukoverepisiliwu.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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 17012 bytes
SHA-256: 17eea41d840e0276608647d5dc622c3568c160d7affa19a7be056dee1651f391
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 11028 bytes
SHA-256: 726f2b85d5a059f22496337df52a827abe309f5a7e7c91bb939d292b0cf63bf9

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