Malicious PDF — malware analysis report

Static analysis result for SHA-256 491125c9dcd3f640…

MALICIOUS

PDF

84.3 KB Created: 2021-08-03 04:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 779ab28d85cdcb633a0a1caf46f3cd56 SHA-1: 6f8287134d4a4b0306b32dbeab4ca1b98587eadd SHA-256: 491125c9dcd3f64075981790636ea51c662777c9c411fd887deb1165af67ab8b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=acrylic+acid+from+ethylene PDF link annotation
    • https://n-zvuk.ru/upload/file/71131177844.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5acnoi8n5amk2gkri8r97djv7u/61819123004.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5db794c29336749b238427d3661cac26/14292365578.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/33552762676.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/63239545810.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/desaxaleb.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/gajinazamitinawalulup.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4eff970ad8ab48792a2ad68fc95ca960/vururotodasadunewobukar.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160865f935c56f---22168079784.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vagunipuwafeniwimew.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/30819364754.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/zugulalimizu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160992febb7313---75557268249.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/23845504645.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/42554633904.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2f41682bd---62790489418.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/pulaze.pdfIn PDF document text
    • http://e-sportis.com/images/upload/dufisag.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff1671a28---bilukutumifuv.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/73837007625.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/64018929261.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/33727719425.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/27789088995.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/75180751863.pdfIn PDF document text
    • 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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 10668 bytes
SHA-256: e2845f6dd93c84c54b2e1d720c6048a56b7d830086a48cb6e9231295ddf83f1f
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 18528 bytes
SHA-256: c6968b96d2058149e96e021309d26d9c513870dbfe94f3d870d7a436d93b67a6
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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