Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b36e3618bb7a1c1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 03:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81661d535864740c097021cbf395a01c SHA-1: d80cffc4d499cce33611125a879254114060295b SHA-256: 3b36e3618bb7a1c143c5625665e6368c720cb2e98bbf64750c6da276c264fbce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm used to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=scrambled+sentences+worksheets+for+grade+3 PDF link annotation
    • http://royalgoodviewresort.com/Uploads/file/gorebiwekebix.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/53646003985.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/redizefiwosiwegome.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/58776198343.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d302e7b4---tosonomubaxukutijupan.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/xufesasirosovuxew.pdfIn PDF document text
    • http://saptpadi.com/files/file/19871857399.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/49097916015.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/93862737140.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab9c73ad3def291f30fb84fb4bdfcd57/13277365304.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160888cac37d5a---rizurop.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/48175003466.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/jubabep.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/xifegafavixeg.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/jerafop.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082434f8751c---duwawufumikoxefimojewodu.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/75648052607.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/72933406430.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5cc71330---jedejaxiwikewurafiboju.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/74c0b50e5cc59760686129903ca82e7d/63228467999.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607081c1a14cf---lajibosufesiwinux.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/bixafuniregilanomuvexebol.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d45adda6451---biwod.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/pamerifiduwasulakuw.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92729008749.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_off0000be00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE00 17908 bytes
SHA-256: 1d3ee190762b2cbe16b6d58081317bba30720dfda6eed791d329d23645395b7e
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 11396 bytes
SHA-256: 0b2c7651eb4f8bad6c4edfb2fd26501b7ada0a14aa5bfb559a37bd01ea3db65e
font_02_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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