Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dd9d72eca3523b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 03:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1b2787b9e98b9f325920d3f24205703 SHA-1: 81a066130da4d05ebe85b7c05482f70f2c056819 SHA-256: a2dd9d72eca3523b1959a3639d79ef63365fffbd25cf645d5a0c8e9e08fa355f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered link farms on disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of 'utm_term' parameters in some URLs further supports the idea of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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=the+unseen+world+pdf PDF link annotation
    • http://woodbridgeabw.com/uploads/files/47799662949.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/76791195453.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057c030653---17203324158.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5afe5698a26236d133ccb5521df34bd1/48891086289.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/jipiroxitop.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/gafazivovelo.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/25131705433.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6b799d3b---maxajabigumane.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/92716461447.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e3eb1231bf231a493f415ab3799185b2/bikolupiwidefus.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/69996286072.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/xezemupipasowura.pdfIn PDF document text
    • http://denge.aero/upload/files/80341402593.pdfIn PDF document text
    • http://techmechengineers.com/uploads/5687920719.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/zolevimirafulok.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/bodafulufuleg.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/576d6597f4f48e819caaa257f505d9d2/pawewo.pdfIn PDF document text
    • http://ailizia.com/userfiles/97038376827.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/minexinogimenovaterafe.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/berarariluzuni.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb82ace888---93505560906.pdfIn PDF document text
    • http://usateatop.com/_upload/files/25196113912.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/39091690378.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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 10392 bytes
SHA-256: b439edc5d001efa34b5922e25d162a57c3d84a60e33717cb1787b5f9b648f0df
font_01_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 17664 bytes
SHA-256: 4e4995e0d3e5e6418ce842151c38e12658eaf9c9de06c16cfd8b48996695326b