Malicious PDF — malware analysis report

Static analysis result for SHA-256 61083991e2e313b7…

MALICIOUS

PDF

89.9 KB Created: 2021-09-07 14:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fc19365acbbb08a531631667a63dd33 SHA-1: 4898083af8d6d0f523bb32dd477727b986fa0edd SHA-256: 61083991e2e313b73acffb7ff81e7d2278a1bf04b65f77c9283ffeb729dc5482
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links and the nature of the heuristics strongly suggest a malicious intent to exploit users via these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091d818a3a2b---85167070262.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/20deae88cfdba31c781fc57bbbfae8c8/jumataxogezukopevok.pdfIn PDF document text
    • https://viceda.com/userfiles/file/52217970580.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d2917efd9cbfa7ad7c74dd22f1436d5d/zisarageponorupazanulide.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53ec07e2d5---25297170685.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ee8c044e---78445212808.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tepupufukevonise.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210823180139356.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d184022ef40---bijetegaxiliwafofejuguz.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6b466828721042ea028d6cf0607bb4f/48036167553.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kiwovenefegu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/zafirapavijeve.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rrbvlal02i4babcdo74p2pn11n/nesavun.pdfIn PDF document text
    • http://midel.me/userfiles/file/nunugobenajasijefedivi.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210821132424.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/wexizenutanemopipofigu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/fegozodudufuseride.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7648a1d79---80849183556.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842b7fd4604---34360785310.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf90572f61---bosagopa.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/61592133552.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2b0vp4lipncblrfbjm4fi1eh3/8334495883.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xatifidoganarajuvapuj.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e4d522999d8e1323ae064477ba8ea775/vogotazeduxumasom.pdfIn PDF document text
    • https://citronel.com/userfiles/files/sivesofemubujalonutebos.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/79311197403.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/31407762427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+modifiable+adobePDF 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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 10188 bytes
SHA-256: 6aec63603832299819b58daa242f419be5f03a50dcd39ed49511fd71954e961e
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 18124 bytes
SHA-256: 1f940200d86842c945c6f74ddd674c025921f6163468ce118587f71ad239b969

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