Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfa3c0b19e5ee5d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-24 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9512b58a006bf08af618d106501075f9 SHA-1: c613f77a614139631059d1f22aaf885a4b6d8042 SHA-256: acfa3c0b19e5ee5dfc3fa8e13833a43863a32115d4eff8b1aabfc766eb8a3a90
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7156186152be17308812ef247babde47/tomomigabunetex.pdf In PDF document text
    • http://mega.kz/media/upload/files/76532216846.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/zevuraranodofoti.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/xufupe.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/vepakatudarubepetiromuti.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20b4c2e3f---24375357209.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/31995047712.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4833ac17---70789793667.pdfIn PDF document text
    • https://ebooksweb.net/files/file/50777505211.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a8facf07b131f90a2c68632b2b8a7253/dexunalizagefefitironig.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/6651716296.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/rhdji5geb704qfh2jtge6ug9kq/61723199343.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/36072741898.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/84943644468.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/29399229232.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/sg907st3dkre8badqg07gcrui8/direnunepabeporu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa88a260f50c2aadc7230477006310b2/vufinosobuvizujipejafage.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37807741252.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92e1b6b42---gitalomolenoru.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0jq8bufhmv29ir548cbmt9p290/vipidabo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/75846474735.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/23f82e6e5e4736822d8bae9f46df2663/65056939676.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bffb61cdb---zodedisifotoxinaxadixuvo.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/985198592ce5297ace4c4f78824964dd/85613689471.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/nokined.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+best+app+for+driving+theory+test+ukPDF 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_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 16684 bytes
SHA-256: 2c40d4b28143fc57c07b5cea98404c6e74ebd91cabe9a468744f58fd70ff8cc0
font_01_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 11236 bytes
SHA-256: 4232c2b297111f2a4975b309e3356be8d9056598345c7d18cad4ef4fe09886cc