Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a317cc66f7881f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 03:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f1175b74a8d9623b1ef4cf90091a7f7 SHA-1: 0df952d8ab7b94d3bed066b79992b7f7b8960409 SHA-256: 82a317cc66f7881faf5081af33e8ee519bfc26b9b4bdfacd8c60d103e2ffc16d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites, acting as a link farm to redirect users to potentially malicious content. Heuristics indicate a high likelihood of phishing and malware, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=physics+grade+9th+pdf PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/642bba46e5e5f39f16cebbe53571a0ba/fuzajokuzab.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5be246d39---9885533243.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/kejutanul.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/lagawuvoxokitapevutu.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/80422553542.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/suvobenikivogokelomudalok.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/3009363572.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/rivasej.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b8f4d0a3---tuketezifop.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5fjsf2o6efr68urumfc0goeof6/dupirufesirenajikemukejul.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/rajasekirejebuzuzefiravam.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/76361515701.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1febcd20e---66209715870.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/taxiwejufojipokuxo.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b590f7b79ec---vekuwites.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/i6tcv1287ndi5nqai8oj80vt20/796783163.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pewugezer.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/62707954752.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc2622645---narawofu.pdfIn PDF document text
    • https://educhina.mn/editor/files/kivusuwuk.pdfIn PDF document text
    • http://allycatering.com/userfiles/15864978419.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/rilatumurukewagimiluk.pdfIn PDF document text
    • http://patroha.hu/file/zewejagu.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/54596971397.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/mujalujulomuke.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 18532 bytes
SHA-256: d5097969110dcb3e3e5f34ca125147aa9bc6224d5f8a5c6e1cde9dd36d7f227b
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 10912 bytes
SHA-256: 082b7b539315a16db79e3520cdb091796d26d547ec21f5155ce290c5bd07828a
font_02_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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