Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb57a90a7b7f1b8…

MALICIOUS

PDF

82.8 KB Created: 2021-10-07 10:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 92a6064866d246c88fc0d2e952ad7ba0 SHA-1: d5111978b6d04044b8637391f14b7d36e09d5b31 SHA-256: afb57a90a7b7f1b8dfad7db351ee903c9c07b4cbe817f5cf3f1583d25fba540c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and compromised CMS links strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=word+connect+level+106 PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613543c90e012---vevogagamizimogofisosevob.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3935608d220b0338dc1b8654541d76d9/dalikesalozutebunotajaja.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/46103944961.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/9118607687.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e034d9fd6---33585282454.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/14852119827.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/bawenosaj.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/70700129638.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofijipuziwevefuz.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/gigalurodexuzatimeji.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/lomaxo.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/zazuworasajuwapovinejeni.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1615e3dce0f18d---suwarere.pdfIn PDF document text
    • https://jjpremiers.com/files/gomujofekobu.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/felozimolasumuwineniz.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/8108907675.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/jiwijosakezarokigi.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/gobamasubajuwanigesu.pdfIn PDF document text
    • https://scalper.ir/data/files/file/49533160773.pdfIn PDF document text
    • https://akconta.com/uploads/files/76929733382.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/79670851861.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/fagoj.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/9959520871.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 20192 bytes
SHA-256: c1a77a64f7265fd5d25af1ec4f37ed82faf0a24bde35d94341e814a78be9df44
font_01_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 10340 bytes
SHA-256: 21093e91478dc28dc8dc817a67e4a88bfbdb20d62d0f7a41869849202147f577
font_02_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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