Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfa6d6b344be768…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 02:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55c6ae8bf165ad8eafd3b6aa09e69265 SHA-1: ad766da9821ce943cc1811a122eb588bb90bff2e SHA-256: 1dfa6d6b344be768a5764f1a69ac78e07cda3bc43ff6c2d8cbf4af36c3df6851
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://elmbbq.com/uploads/files/23034809619.pdf In PDF document text
    • http://rc-modeller.se/images/file///mirepedalewoguronalagigum.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/vedodimirukafokugut.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59ea948f9---56573782660.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347213cb7d4---dogosenefipimidovimarub.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210909_034727.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/97023635712.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6b8r78b0dik5nmt9ocv81g4f1q/livuguvuzogipesarekozo.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/83223076720.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/887a03943a9c42def09e669df0959c1d/gilugagum.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613035611914a---fuvatelifawazepega.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19f1d5cc95878c52fd1da123d3af8a18/87893231004.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210904_9C3ECBDA08F0A825.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/43023527065.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/pomaxezerof.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/77121941675.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/2449740165.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/wuvet.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/76836794323.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937d647aef---18496056486.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/74952252868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+android+phone+to+bluetooth+speakerPDF 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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 11020 bytes
SHA-256: 12f75641b2d84fccafc2805b4bfdc6600b6ffaf257a6fccdf4d61b3fd0c9c732
font_02_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 18236 bytes
SHA-256: 2b40c169e7113de2fed0f4182f0e54c07a33d6c4930ae7832be2f23cf9d748ad

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