Malicious PDF — malware analysis report

Static analysis result for SHA-256 4662b79240039b67…

MALICIOUS

PDF

125.2 KB Created: 2021-09-08 04:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86c8d2a379c16feea2d70fabb84b1aa0 SHA-1: 7a32e89a33aa0e94eaca05f45433fdd0631548a2 SHA-256: 4662b79240039b67efe2dc1a1380bc5a5b5a64f4bd681f96b8adfb673167da89
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be redirecting users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.greenlakecruises.com/ckfinder/userfiles/files/pexasegomebagapudifoleda.pdf In PDF document text
    • http://195exim.com/datas/files/rofebimalovoniguwalej.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/wavutubemotalufuxeput.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/zasoluxefa.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46e1e52c91---robuvufosifu.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/lujotuderusajijubadegof.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/buvirafojezatiz.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/zupedomuposagizadilijot.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/293297585.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/1048747705.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/16375072403.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/sekowudidirefapemozumer.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c60ec1610073f54d0c0ceee2ed4ccf5d/71888757944.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/17d217b60ee3b5308058cbc8aa4c700b/timefolefuvokavafipe.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/52b827f6a14dabb8aaaa3c5862305547/83712260670.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161080c551ddcc---36662063564.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/74131446846.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a7db3936887f3886dd6191a1abda688c/48508184349.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ikld4rv26as9p2kl9e4qvuoo48/3453744073.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/39765242339.pdfIn PDF document text
    • https://denimder.org/resimler/files/9624713659.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sobazodunadinikivujav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=zaffaroni+pdf+derecho+penalPDF 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_off0001806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806B 10412 bytes
SHA-256: 601965f5fbb86d303980a1ebe6c112c5ee2cdd66a2f16b017d358723a513cb47
font_01_sfnt_off000197d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197D4 21484 bytes
SHA-256: 3d238601c1ed64ff0477f5738eecd4f264732496d085028b57117bd9399c349b
font_02_sfnt_off0001ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1