Malicious PDF — malware analysis report

Static analysis result for SHA-256 9713cadcfb98bc84…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 22:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65090971eac28bef144001b17778fccd SHA-1: 5348633f0c5b88def26014521b1a2059a72b7de1 SHA-256: 9713cadcfb98bc8418c20825f8e5c35250b0509e954fd49ed9d4fa4ac75a7bae
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://esistore.be/userfiles/file/83309803968.pdf In PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/48882816639.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210913170601.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210901145622_851402142.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/46939060258.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tisuzomiwofifirob.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rnau9nocu04nt3vi0m1pfsv8r0/geruvivadipodivulesofeku.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/74544645716.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/korivefarigaboviduxumele.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/83746351697.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jadomatubelob.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/jutajebupe.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/xameremanozuledu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sufuxajov.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/bawekul.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/47563311951.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210902_5480272402ED65F0.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/webirunitavebamufirubud.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac0460cc0---98173581939.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/livurozojaxasavewajawi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437acac2978---38923007241.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd7f7c78e---36819165914.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/11110171769.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/78358493239.pdfIn PDF document text
    • https://t2sc.me/userfiles/14174218056.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/zejikatunezis.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/bifekokaletikika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=camper+aw+man+roblox+idPDF 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_off0000be57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 10648 bytes
SHA-256: 0a50c97fcdbfa4aaa9ea2e74f5d6e3a2b44b6d9de9279d5be55f5e285f48080e
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 19840 bytes
SHA-256: e35d55ec1c05b703d81fc7d68a8fc997f709ca09b2353c17cf012fa24a2ec351