Malicious PDF — malware analysis report

Static analysis result for SHA-256 42dc2e10bf51d15c…

MALICIOUS

PDF

88.1 KB Created: 2021-07-13 05:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 09ed75f5b473e1e29887fffba78233d8 SHA-1: 1bca6e4d6b62b9f125456abf6757125f673a5063 SHA-256: 42dc2e10bf51d15c19f385652a20098c3c05eba172799c2e639361d289ffe39b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://tourister.kr/userfiles/file/5721949416.pdf In PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/49314dc02b583fc4e47173f658497184/61759594017.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/xovifezolurukanilu.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/72512605752.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/55382029989.pdfIn PDF document text
    • http://jucal.es/images/file/71003732382.pdfIn PDF document text
    • https://okvino.it/file/87230941081.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/saruge.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a99rmi2mo6tkg7l3umh8pgjd32/zinokegelo.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/40600159482.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/80513779726.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/mosadopuwafofi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/00iiamtthk4cs00aoaguv3a1d7/musososisujeditineri.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/84710580179.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56b5b4687---niwonawamugasux.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-25/20210625174912303919.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/h8s5uslvbvmit0h8a2feh68512/vixexelopeke.pdfIn PDF document text
    • https://aneri12.eu/res/file/jimosizegasunemesikuri.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/parisaxomavere.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/55833772734a046bbb544224240fb85e/19664101318.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2a5f5ff6886ccaf224cfa5c67421f585/guzunalovitofiwep.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/28814515115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+many+sides+does+a+regular+polygon+have+if+the+interior+angle+is+156PDF 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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 17560 bytes
SHA-256: ed985da773c6031d683263392d9a16a169a02ae4639f97c22314982d34cd719d
font_02_sfnt_off000136f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 11656 bytes
SHA-256: 83a4968230e4a687291edaf02d35071ef34526b91da1e4f3edd9d94c2cbb24c5

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