Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6b0f12e0d3747c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 02:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6428803a7d58efa84452dc7e1beabaf1 SHA-1: 8cebad3f57d6e72eeb49f4106aff2ebd0ee9f9db SHA-256: fd6b0f12e0d3747cf45c16e75479f95a2a72afd2f77b2790b1682671ea9e29d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates a pattern commonly used in business email compromise attacks to trick recipients into changing payment details. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest malicious intent related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=how+to+transfer+pictures+from+android+to+android PDF link annotation
    • http://podwierzba.eu/ckfinder/userfiles/files/25626693181.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/pigexuw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8d4967113d48a9ea22c544af40dda7c7/93518886222.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/dikezepap.pdfIn PDF document text
    • http://lblussana.it/images/file/71696701800.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/noxurugopujujonolimijelew.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/dugokevadubafadasuwomina.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/98008246614.pdfIn PDF document text
    • http://kaies.net/upfiles/2109060653099636486kmfa7.pdfIn PDF document text
    • http://195exim.com/datas/files/kuwakubisetinurit.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/86847165634.pdfIn PDF document text
    • https://megashina24.ru/files/files/99808031538.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613642f417156---boziwavuxogin.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ee2815d---zigetebokijimubusiluvivo.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/mitumafisulevasu.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/wigusonusovizexawevebut.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/63972675624.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/judovujakizikaxagujebu.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/80385766621.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zalowegutoxodukitovaronax.pdfIn PDF document text
    • http://change4best.ru/upload/file/vikut.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427a841ef96---tesafalutigavidaxanivedes.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/nebelinov.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_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 10912 bytes
SHA-256: 46546284ef6bda455295df0054c6ba8ce628c509cc7dd7bd4d951b56e721abc5
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 18688 bytes
SHA-256: 70f175582624aadc7da0726991f47da3a344e136ea0a47e44eced3310bf10b5d

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