Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df9381e90063688…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 09:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb50a6179c644720e9fcb2dc4e4d6b1e SHA-1: 8d6f0166c400942b000638464ed785cd143f30af SHA-256: 9df9381e90063688fe0252232670b1a66edc71fa65383059f807a2517cf609c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=how+to+put+jetta+in+neutral+when+battery+is+dead
    • http://mmckno2010.zkosuchdol.info/files/60461599473.pdf
    • https://room12shio4.com/contents//files/pizabukuwasemomemubonuk.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6d1334506daf694cd4530edacec96f9d/71415042034.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/rubiwu.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9f38758335f364846c1bd89275a56355/lobexawarojix.pdf
    • https://soechi.id/userfiles/file/sufaze.pdf
    • http://chickenwild.com/upload/contents/images/images/73796305429.pdf
    • https://jf-orvalho.pt/userfiles/file/velotidobelogavitenes.pdf
    • http://ttmplus.com/userfiles/files/93879332096.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/493d287fb1a4cffddb7eb1fd831ca75f/nizixivo.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075524806430---22518422154.pdf
    • https://altonika.pro/files/fck/file/78910377762.pdf
    • https://rajakeempat.com/contents//files/83533163962.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6a6540e0fc4d9cf14125d0944f18df88/35568703562.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae593111a5358790d6bf7afa0e6bb3b1/419587993.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/volagodetobi.pdf
    • http://wsystem.sk/userfiles/files/jupofomeweposorezuw.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8be2463b---vofupag.pdf
    • http://redigonda.it/userfiles/files/24371382690.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mical8migkf44ducat65e2n83m/37465145213.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eb5f37b09bb146d954617e923611f9e8/10927993317.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce011e04351---maxojonodiw.pdf
    • 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_off0000ed59.bin
87ae5e4fae5b422ba64dc7ecf528de0083ea7c9b46cd647dbf97201e21f21fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 11052 bytes
font_01_sfnt_off000106c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
font_02_sfnt_off00011ed3.bin
4a125fe23513b4de18b5a7724e50cc817a6a99361a7806ff89186c56d5564ec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 17028 bytes