Malicious PDF — malware analysis report

Static analysis result for SHA-256 290a7c8b84f471f3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 07:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e506d9cf63cbda2b4f2828cb9571637 SHA-1: d5cdd3db7425f0ea532c96e25127e9b0fd394d2d SHA-256: 290a7c8b84f471f32444010ee3794cb31737930ac26df84c3f8d2688da6a907c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to PDF files hosted on compromised WordPress sites. This structure suggests a link farm designed to distribute further malicious content, likely a phishing lure or a downloader. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f48ee2c019---webegunitezo.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d07ba71f974---50250583190.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/20294421422.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee45bab2d---nodigogonokuxam.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/cf91183a70dd435c3242f592df25e32d/vogegalivenanoxiragitefag.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/26066787241.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/fd909b6491910e9bd50551126af979a4/47862863340.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sudoturegokamepajese.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lawuduzawirilozitalobuv.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wolonitawifefegilifigo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f594a6f856---10765817599.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbcb97d43b888d6acaa6f6e8f28b2f39/4720046787.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/2100466781.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9463be48---kigojabuzemasiga.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b969d22f---50178202653.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/74691199281.pdfIn PDF document text
    • http://charivne.info/images/file/rofuzulobi.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/73442312136.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/nawavemol.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c787aaa475439663677e42381349683/91212148759.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce44651be4d---66485405275.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/62912575151.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210624/210624202552267247766ke1ugf2u6.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/19779775398.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b891f6cb119---63967229651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=southern+ghost+girlsPDF 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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 17144 bytes
SHA-256: 97710d749463091516628290f2c06e28e450487b54afb83e51d1ee997d521e23
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10400 bytes
SHA-256: 610bb2a0d7427eb97d3ef39cf8651138eff411326c8df9ca4e1cf3fc58aa71bf
font_02_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1