Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08c82ba52c406ab…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 01:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 959546934b5523f48c1f3ef1edcc3e87 SHA-1: a0bb660918ceff319feb3176574ea29cd1eff210 SHA-256: e08c82ba52c406abb8788f1f7b821aa37137863a39635f03527bf8c7baa2ee74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised websites, many of which are hosted on WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics suggests the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=my+dolphin+show+unblocked PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/3ghmkj2n3re12eh1ct88qojf0r/76344702242.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/suburokidexupaleluvoposob.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e68ebc89d2da2cef3a56f18a10c912f7/41648044510.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/72586469597.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vepijokifaxobu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b61f85f3de6---82311227400.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0079bc2e8a60a438c0bbd7aa1feb6750/23548505656.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/solupanagoja.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefilafuxurik.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/10281701288.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/46832302632.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/586464171.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/47037294642.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/61823555283.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/kivemodizurufepa.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/trs5sghrea45hb6k7b55vqt3nt/vitimiwadabujisuxime.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c53a966a---2990679687.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/172ddcc02b6a0d0eb979a3dd914b4a23/pebakisotosijuwax.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/44249080943.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/vivovakoduviku.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/t2voo96n84cblssnua1cjvqf5t/35918096925.pdfIn PDF document text
    • http://elma1.ru/!upload/files/95423530284.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/86952222436.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/76a35057bcfdccafba7bfb8eaf1de94b/vubibebuberax.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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10776 bytes
SHA-256: 295b7d55515a4ccb2ef9a11ca1766466119bc2dae3199667f6a7ad50b90b922e
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 18352 bytes
SHA-256: 2e8defd9edba3aef04926c32b27cebd06bba04425accbeaba6e8ee20240f97ef

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