Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c42f44abec9c85…

MALICIOUS

PDF

85.1 KB Created: 2021-07-19 08:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b7a8464537683540551e7aee123c0f0 SHA-1: e19200078016c24af12b9b7d47cc0efc08e78dc5 SHA-256: a0c42f44abec9c857692c35541f65f6bf85e45d3a64bec7bf170b4e06e7dea5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests a broad redirection infrastructure designed to obscure the final malicious destination.

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25f6e1888---24713103664.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/eperetuwetanikobetulome.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608642292dc18---fuzomixarizonivivivap.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0a984c5e308e9c1b03bf1e6ef11b1ace/laxipanogasi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/palijafugojadibekosipu.pdfIn PDF document text
    • https://t2sc.me/userfiles/94180221093.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/24756265848.pdfIn PDF document text
    • http://usmleworkout.com/files/file/busitemaserejafugaviw.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gufepefojopuk.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/slvuvccuihd88m2g4nv2iu8dd6/73541694558.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v3tlvno4s3umvpkm76u7376nka/pezomederixofi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/67994946533.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3cad320e5---nowigowuwanufepu.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/duwabesujubonilomobajuseg.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/33209801445.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb77c1d01---24407506291.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/jubusezokewagemabizulew.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4e7431226a91d4f4638de96508a235cb/lirusanuroboxizogujo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9a3f1b1073efa68a39ecb7bebc9513b5/7626704997.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/jci67kmng2sor3h2qqd5ascf51/wutuworavijokinu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c4cdc8e---88739455594.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb14af0497---zoxeposut.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/394b42b8f2c72f09b8865006cb9fd9fa/nedopalefabokoparako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=image+resizer+in+mmPDF 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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 10200 bytes
SHA-256: c2fc48531dfe985914b85635f91933ffefa05250549379ce2035de08029c4910
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 16500 bytes
SHA-256: 2e985aa0acdadd4b3c8b6102d7629971ef785083b0eb96426700e0a4f83a8098

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