Malicious PDF — malware analysis report

Static analysis result for SHA-256 64473fd358ed6c25…

MALICIOUS

PDF

90.0 KB Created: 2021-07-28 09:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fc895751c40a67d0d612a200f7cec81 SHA-1: 891b1460cf202f795d95643c611109a09d8286f2 SHA-256: 64473fd358ed6c2580b081cb301d6f3a286bb348d3bf01ca267ea55d2e5397b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The file's structure as a link farm suggests it's designed to redirect users to potentially harmful content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://donkaew-furniture.com/ckfinder/userfiles/files/jugepibi.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d7a76fce---pirat.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31b141683---41381209489.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8e6f3c0dc755fd16d788a47e836932c8/bofojebajafitegopamefas.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/9454068892.pdfIn PDF document text
    • http://yuha.be/_files/file/dadukuragupejuwagaxuv.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/danivan.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2184d94be7---rosodas.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/diwobuvil.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ad3b6efb---zuxom.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/64053499245.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/wetegazorolivadutibogoduk.pdfIn PDF document text
    • https://proxus.nl/file/64157041683.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p81ce6qrvgbbpqsj4igu2ooacu/noxevarelegoma.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/nowaxe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082451c31a0d---tiwovomo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57577154165.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/63635618005.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/20060662605.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/83068683770.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28ad533156---dibuvosu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/aaafb33a4866ce98c238070d0d047d33/30600606097.pdfIn PDF document text
    • http://vishalaholidays.com/ckfinder/userfiles/files/39638260099.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/66643113852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dragon+ball+z+games+for+psp+emulatorPDF link annotation
    • 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_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 10912 bytes
SHA-256: 693cd7a5455c624ecc5a6a12cf5868c69cfa0a23a81aecb65ff6eccad6befe4b
font_01_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 17360 bytes
SHA-256: 84ac255a045444f3831ff64a0ed2938426983106eb979bc4ee1f627de443e524
font_02_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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