Malicious PDF — malware analysis report

Static analysis result for SHA-256 17805fad813f07a4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 04:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b03e619805a4a8112b49753e4d659682 SHA-1: 6db55055eb8ba80515ca2cf5dcc590e55344c2ec SHA-256: 17805fad813f07a49c2788c250357fb3a6761efcdeb399a0517f0b33ab2f5251
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristics suggest the PDF is designed to host links on compromised WordPress sites and disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=kenwood+car+stereo+manual+kdc-bt362u PDF link annotation
    • http://unitez.net/images/newtech/files/xivuzagudipupi.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/38837169398.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/2658550777.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fawolisofesowosami.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/61555294509.pdfIn PDF document text
    • http://princeverma.in/uploads/files/19512370136.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161060e00a8de4---xawemavapikujevolilana.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607502712c646---68881013892.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2t880af43hfo5p49m2f4lmrgf7/kexugabuvixukaxolagap.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/jetir.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/4400920486.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/zugipepazokudirerad.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/dijirivuxurabij.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b658d35125e---legufuxenojixafiku.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/96804579676.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210831232347.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/70817217516.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7935f2fab---lamasorubupavosinunaruj.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/58868174294.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/legolesuzidajamipejixil.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/73646819327.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/makoduwatojujagepo.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/64294435504.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xafewilolalewekefapumoki.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_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 11344 bytes
SHA-256: 34a27934a66f3a5785febd39521c2b86c490f13e9e5f29b0157f7f7387815287
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16772 bytes
SHA-256: f16e091c3eb859ab1786777982e70b0f6b3bf839aea796b95ea52991b8084cea
font_02_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1