Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44b11da5605b2df…

MALICIOUS

PDF

91.3 KB Created: 2021-09-03 21:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a02e6d4706a476d69b0b402ed689349d SHA-1: 470d9b4ed6c60a9c2fffb7e760053a25049c0a7d SHA-256: d44b11da5605b2dfa294d8f7fccc45d0b4501b591df7b0ff3b84f485ee146787
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It impersonates a document signing service, a common lure for phishing or malware delivery. The file contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://mollis.rs/files/gudotagukiratajaresuvu.pdf In PDF document text
    • https://artenika.pl/fck/file/71495787244.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/tusutanixojax.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/gupojadufedakanupikav.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021081920021811.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/85478966697.pdfIn PDF document text
    • https://shinaltd.ru/images/file/90438324948.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/99724486146.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e78aeddd---77380360806.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/kilifubudumep.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/daweg.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/24526504672.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c571266b50b---dijukakufotupunojirukov.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/nezilapifofipozefapu.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/72443948198.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/jusuvuxeponutesatet.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/q4oqt47hne9pfdjkruhlusi4pf/sifopisofozogir.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8133103caa4da5d755498a1d0ace17a0/soverovabatokodudiju.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/zugapekilopatupikof.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607608019e6a8---gidojenegolizux.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160999015abf66---fulegozodirarixerojir.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/zujagatug.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e9d15ed88---fugijepi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b4c6ca4df3bda02864c3edfd298cf09a/69620846512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+combine+software+online+freePDF link annotation
    • 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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 10864 bytes
SHA-256: 1ccfc87c9c0dacf6c4605b88356e7b833095bf2ce5650b46a6529cbe107326c1
font_02_sfnt_off0001316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316F 17792 bytes
SHA-256: a53bebf446dce4a44c965b668bc3b4ff44ab43b9ac9b073d3e3f180b981313a5

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