Malicious PDF — malware analysis report

Static analysis result for SHA-256 b169d15fe0de1483…

MALICIOUS

PDF

82.9 KB Created: 2021-07-31 04:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 829f50f2d20f45699cdfd9bdc596d847 SHA-1: 67b7738a4e9a736bd210f9349e39395f7a7a1f10 SHA-256: b169d15fe0de14839951470689d726e1c8e8c2250aaa750a973c49fdaa7b287e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sportsgarten.com/editorData/file/kuzezabemuzik.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f12908d15---katodiw.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/62632951958.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ae7934be---pigiwaxapimusinimimi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/bipeme.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/nesag.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d165e8fb73---78141727683.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/c7tk501j4o7m3rjgqana935ut6/45106003840.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a4a6453a4f15e6b15f8142b84142228a/30509323334.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f1ec972887332e0c5b8328e3e09aadb1/82956729653.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/jitiditi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd234d736---sijotaxomodo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6f21602a---kakutazosegemokufigowo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zejenolobavodisetudo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160859f03968bb---vekoliloxawowuz.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095f6e3842dd---83128497951.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/95404128976.pdfIn PDF document text
    • http://matras-devison.com/upload/file/vowejezuruzopisaki.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/58775934543.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b9ccad07c074ac23ca826c5548c4602/82923523802.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/80049796290.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/fomumevavelud.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/gogagalulifobukexolele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=my+cafe+hack+no+surveyPDF 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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 10564 bytes
SHA-256: 269853cf8aa5196a357e8bab4482d7575665f84748e183e78609dcffa25a6a5f
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 17364 bytes
SHA-256: fec53f70e061c42b36192a1f7075d0ba0c96d689afbee68229c39f8c708dd9e3
font_02_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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