Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c131251c970c78…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 04:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a101a61e59d899be4e4373117d8f5dea SHA-1: 4156aa9affd5a1428362226ff4a2988d4681c507 SHA-256: 39c131251c970c786d25870ce42074520ca1497aefcdab6a01c22eca8ef262c3
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://webmakler.org/userfiles/file/josexeguvigufikikotatola.pdf In PDF document text
    • https://careersourceokaloosawalton.com/files/public/96985675490.pdfIn PDF document text
    • http://119pump.net/d/files/xigofofejenatesigum.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/89963434605.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/6646650465.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/59356313671.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/fatupuxixemakosa.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/15343852701.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/4940700818.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/22400603315.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210903_014654.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nuboxifer.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92aa8ba80---sugexewixerulur.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gopemujurumo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/18244419eb8e01d98eb7128edd725b47/zitamatizafimaloja.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/fowomixalepagesabetukul.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202195235584986.pdfIn PDF document text
    • http://fteq.ru/files/file/tiwimoriv.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/nojufofilag.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/6944053549.pdfIn PDF document text
    • http://megalaserasia.com/upload///nijititilagixigikemol.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bsg12kpoqhn1c425rsq0h3j865/69701491973.pdfIn PDF document text
    • http://agmapure.com/upload/files/godiredazofopemilolizod.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210901_84D3739D8C6997FB.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/50498521215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+game+sniper+elite+ps2+for+androidPDF 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_off0000b465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB465 11048 bytes
SHA-256: 7e03703e62770abbd4b362e1619bce2968ef2bfcf7bfe664945fbd18d3917845
font_01_sfnt_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 15400 bytes
SHA-256: 98604cc98f986373d5d632713d600181377ac4bcd474c1e5af9a1c87a9908d2e
font_02_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1