Malicious PDF — malware analysis report

Static analysis result for SHA-256 11edf966a3cc946d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 04:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f5b50a44ea75299a4cc7cebb5ea29cf SHA-1: 2876d3d010f435a907d755d25e97970342f39b48 SHA-256: 11edf966a3cc946deb3ea4b171c2e308eca6679acb9ed1413b8002bec4ea81a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous compromised or disposable hosting sites, likely to distribute further malware. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.psk.com.au/application/third_party/ckfinder/userfiles/files/46689998379.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094359aa6a50---jelowu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e89d56edab1b25bb0e7d3e2f53f32a14/tixezozepatok.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/mokevuxizenuvo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/6373744120.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9de80cbdb---nupasosofegaxitapipoza.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b0a745b630b01721f5a905e1661dccaf/94144114352.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e2f3032e6c4d1cce5aff74dbb10a1930/werejunifixi.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/98920426452.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91e91a6f6---50472078484.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/gololomatitomeboke.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/34489328480.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/kufafevasidadepikozofo.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/27540368395.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd63247d155---binilofesesonis.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/11985024804.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4c9tv52uf17d5fl9psrg9fpo3p/93152356251.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/sutitog.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/dudufisuzan.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb47a8a99---45394805834.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202172849183841.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ca20b216003737ed3b6eefebc2953730/64627576104.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/namozaxupedabezobet.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8af5c388---64948190778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+pdf+books+free+redditPDF 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 10812 bytes
SHA-256: e8946bd079be08d1b495cb20b1e3bcf64e0dde8afdd5383fb991cc4c5ed1355c
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 17516 bytes
SHA-256: cdc3a2d02cec792295e637677db084c7306df2800aeea30f97c4531c110b4120
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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