Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef94e236963d1ae…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 13:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 175aaf82109f040650e55d925ab6d133 SHA-1: 279418dc2a1c44b161acad69dff75a9ed12afa7f SHA-256: 8ef94e236963d1ae2bf1563d3554447b80e1979c718005711600d335342bf23b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nitecoreromania.ro/files/file/zizobenosipolotinukiden.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/368b66d5837da9b51b4ba38abfc20a6c/jesetidugulakobedazazufu.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/dimegarenoberidumadozime.pdfIn PDF document text
    • http://newo.ru/files/files/delegudifas.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/32380176002.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/pagotogumoxowato.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/gobetusonubezatoromofote.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c1dbed59ff8481243af6d9a2f90e9e74/67378946761.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/61853316172.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd002b5736---duvataxolodug.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/vuminamo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb692c4537---veduroxawani.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a9ac9f66b3156fee72501120b609c1d6/8745661162.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sijezalasunikodetebudum.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecde2a30677---73647298157.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/natilavadowage.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/742b4b2eff87c67581344ef240f5b2af/547942986.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f9aeb340fbeeb8abcc2df3d313662a1d/vofazurukafexejazodosuvat.pdfIn PDF document text
    • https://botroul.be/uploads/71449222016.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/47753388829.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/mamevujexivogetewowuj.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/wunomapuwa.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zojubolalilobubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2012+nissan+altima+sl+manualPDF 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 17900 bytes
SHA-256: 7108e0dbdb35e847db47d4894ece7d3132a580d6ae6f4563ba55b3176cdf4d6e
font_02_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 10212 bytes
SHA-256: 252e757dfe518f6bafd81bca6a83d79d59dd2e7e894994e483794f775cc81230

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