Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c459c2eb4d417d…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 09:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc8e946014e750c0825249aa48db116d SHA-1: 9f854e39084fcdd811decf10ea682afad273d303 SHA-256: 21c459c2eb4d417de194517037cf61e353b8b81dcd9d6d5e70d4a2e885eac7ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious files or redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, indicates a malicious phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a94f0562f75cc4bb85b89477deb18e6a/89014278961.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad045556b---70416936385.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/31549739451.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/gabopoviwebuvokol.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/valufotuvuripo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/be9972a6461d6f27ed6e61a188a63fc9/lidamufurerunekumete.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/segorovenadevojisetoxaxuw.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16113755e0e5dc---70325852084.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/gitimopesebipisebu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/watuzulilutasofux.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/78210945437.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/nusezowojatepaxa.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/bafiw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161198ff4c2423---63666072012.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bezitelod.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/sibebijawudevodorofot.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/kesowes.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a13614f54---fipebumobinajitidapexusa.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vodumododex.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/7829288613.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/89465129109.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/97317701890.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/duvuxapamozoberusesi.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tediruronefonidevowawimal.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/84107677899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ps+vita+emulator+for+android+free+downloadPDF 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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10768 bytes
SHA-256: b48fa2f1f69cc367b3ff6e7ef6e2838d7fdf697bdd97d4e59a81c35667b47ca1
font_02_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 17080 bytes
SHA-256: e5375357c3d49da03478e694ce8cf2eeb1fc2ff73005d3347f185c375a81afc8

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