Malicious PDF — malware analysis report

Static analysis result for SHA-256 280edf32c16b8c5c…

MALICIOUS

PDF

82.2 KB Created: 2021-06-28 07:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0ba206ce22b5ef9a8fc64ff9bbbca4e SHA-1: cc499299714b3fb87607637cc3e0ba69522ad0d1 SHA-256: 280edf32c16b8c5c0f05d75b3772d6e48a0c705dca4242b6aadb641d76bebb0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60d5505e4---vugigidutajovuvidakofiriz.pdf
    • https://europartner2.pl/uploads/dezovedodefi.pdf
    • http://massageindex.nl/images/uploads/34873480167.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099617e91764---76220621202.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa03c0a62---55338617530.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/garewonatejomejezakaj.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3f3f9c1165d12d2a7459b2667193e41b/78066131174.pdf
    • https://asset-books.com/userfiles/file/60318936240.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608463feea337---50871399125.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hvbs0m7d85jjtsv2m4i2cvskf2/33947490549.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eccd47145---50466269468.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ce190dc28c6bf976b549286265f9f96/67888689280.pdf
    • http://guides2alpes.fr/uploads/file/62098801185.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb780aaa7c---45726997919.pdf
    • http://tokyoracing.hu/userfiles/file/tugoguruxazixazovis.pdf
    • https://tenekedjieva.com/uploads/file/39166383199.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/46375917392.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ebaf2e7056f4581e54654c3e554cfe56/96235972448.pdf
    • https://kisikana.hr/userfiles/file/962026153.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898bfc3efc5---suvijojabavapudutir.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/7246671982.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaff2dc4cf---baluwotakibepager.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/54f457f0d2aa03bf10292dd296b738f6/nivudorosov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=3000+oxford+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01a.bin
7c3b9fceade4306b1e76e490ff1b0e9c0caae2e36385735e3505096bb6c5dfb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 10096 bytes
font_01_sfnt_off0000f6be.bin
fcbd73bc674f5985205127d2afcedffc1252c7dbf109582002302ac70812a710
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 17300 bytes
font_02_sfnt_off000123c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 16792 bytes