Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5be6b372c3ad23…

MALICIOUS

PDF

87.1 KB Created: 2021-08-21 04:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b61607ca6dd546ae19e258530dceefd1 SHA-1: 68c110df7a2dbcc9e14ed854c1da83a77219a308 SHA-256: 0f5be6b372c3ad23dbeab97f337bba93f47081d3d4f2448f633cd90198df8429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=comportamiento+organizacional+stephen+robbins+17+edici%C3%B3n+pdf+descargar+gratis PDF link annotation
    • http://aurastaffing.es/upload/file/nuwidozusesidojemebe.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c675894c1---50829131921.pdfIn PDF document text
    • http://accronline.com/userfiles/file/detagipalalexamepiz.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731a983ac65---zitegilupuwumakag.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/51f4b3760684e08102232cc376bf53fc/48714191477.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16111b6d52fcca---4290377276.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/20987951231.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/826024909.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/61213173623.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a663087c5---gutudipusorisirafibux.pdfIn PDF document text
    • https://bauarch.bg/files/ladipupi.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/84028460440.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/75923993561.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/388b223a3c878c61224f7fae5a52260d/32167896224.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/98852038877.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a76cadb4920---14275062811.pdfIn PDF document text
    • https://inncredel.com/uploads/tuluxud.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/lofonuwozop.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7149945e83a8c2b984db76a244f89b3d/65519154344.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d510df19ab---30944278795.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qmc28rbdudiadh1abg399rvive/52350813762.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102c95e1beb4---15699088158.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5769c0ab87383e4aaa1e699173b400eb/gajowutagadasarifiz.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/dmpj3i2tsbkr1rnbapbkgfljvi/xupovuxiva.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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 18740 bytes
SHA-256: 5eb57e468a4b6bdecc58e1440a816babe96ddec250085b3784b6676894eae9d1
font_01_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 11540 bytes
SHA-256: 4b280c37fc1433758df79eb991c360dbef965896cc4658690c16f2d70fff7610
font_02_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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