Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b035e8b062894a…

MALICIOUS

PDF

73.2 KB Created: 2021-10-09 08:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c1900ba8cd6dce6f92939681198b72f SHA-1: be3874f6c8ffa3de7bd233322bdab7e530b0d89d SHA-256: 65b035e8b062894a1061959c735e65abf5f0cdabfb4b1ac8c64db1159043219b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the presence of many external links strongly suggests the intent is to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=how+can+someone+be+color+blind PDF link annotation
    • http://jingluo.net/uploadfiles/files/duzalunetunawaxokusotas.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/57811379450.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614264d926278---vorujevoseguno.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/74182879719.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c691e54ca7---pajofopiwaledo.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/bosukeligopasazusavofema.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/42441786613.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210927094941_go0soi.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/88069447083.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xuwasosulunizitefi.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/54226368979.pdfIn PDF document text
    • https://parc-hotel.info/file/vakabijobubavaxivok.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wuzilurejatofuz.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/88562048861.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/99063775808.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zomagefejoso.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/rokep.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/binotoloxesi.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/lifuwagusomevowilolusi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615c2eaec9322---dezopubawe.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/mebezajogabiluxupigu.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/sofunekotojesore.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/rilokogutiwul.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://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_off0000c046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 17212 bytes
SHA-256: 5d17c5e6422614ded55c5d4134482030bd62a6ab1cd4d9d227e79732bd60c937
font_02_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10652 bytes
SHA-256: 8dea7d9538732a9bf3c3c13d6eecfd91e3f0a3f0c9c37bb025ef9ce4b44a84f8