Malicious PDF — malware analysis report

Static analysis result for SHA-256 264c910da18fc7a4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 17:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e118a2c8ce3b8d5ff1e957b5ee688dba SHA-1: 706a89bc8a1d589d3a29f93998fd67d4235863b0 SHA-256: 264c910da18fc7a4af518badd2aebcf8d1ef5207cfacd967b80a50749c9cd6fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=conversor+de+pdf+em+word+online+gratis PDF link annotation
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/kfquq01gc57ei874pdkiht1h4h/4948249370.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/52188329530.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/gapobuximafawe.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/15e0e846bdeaa70211ec93d90e734950/14306895732.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/babazalokelilejula.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085c01fe04fc---271179132.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/45jvss4gdsd5nujkt87uvl1un0/48843598950.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c6c4d50b---2017830954.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c0be68d4c55316c614de1f37ae3fb606/33575517275.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/32022475736.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/2196524214.pdfIn PDF document text
    • https://people11people.gr/uploads/File/17917998545.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c190a670a0---refikenesujedofewakejato.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/81995056329.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b68a35c11f---44907193883.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xonuvodud.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a149d9cfc---1580068605.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1610963c0ed9de---ruxawugafexolegonepojogid.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vkk714ugk44us6g0vndjm02mav/fovopapof.pdfIn PDF document text
    • http://plncse.hu/php_data/file/sijifojewig.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/dolesinaniwemikirafakozub.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/zatumogaxevalojam.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_off0000ba72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA72 17056 bytes
SHA-256: 3d9d71dcbd411b57df87b2833882c2f1e8b75b9ae2e452b31cbe00bb244f92de
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 11024 bytes
SHA-256: 64994f012a13328bd52614b20ac28dba0bb0ba06aa0e42c23962688129d0b038
font_02_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1