Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae4e95d0ac22acb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 10:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f8d8cadbdb805b970edeec4b5d1719c SHA-1: b4886f49cfc6152eee1affebd0ba4879fbcf8243 SHA-256: bae4e95d0ac22acbf3627ba436602c28714f6baf3726cce8e4f8d4715f61d76c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=1v1+lol+apk+mod+download PDF link annotation
    • https://nocnepal.org.np/ckfinder/userfiles/files/rogekakunatafewaweb.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86464989256.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lovemuselajew.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/xizezumarekunarego.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614528c00eee9---30828944208.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/lagamuturo.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/bowerokumumirapukuratilex.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/bezujogubidomigigule.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/20225229897.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/gisepevunoxe.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149726e462ce---67675124268.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f8spjaa900s8u6t5b65tnj8nbg/22153537890.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb59c8cbc16f005ad9074b4f92d87577/wubikazidapesudiruf.pdfIn PDF document text
    • http://webbuilders.com/files/file/lagokigifipinovupawok.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/66374460981.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/favoxivuvavowanenunozef.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/voxolegenez.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/55842745262.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/vobimimonilopul.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/fajot.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/bijabizetezaka.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/70868628919.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/56449088480.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/98145434786.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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 18132 bytes
SHA-256: 433ccff9645b82e6f8f63d35ac8b97e45f6d8b6f4cb74cbce72a86e91129642e
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 10160 bytes
SHA-256: 45f031a7253ad7ac8fc233bb70ceea088cc0d8770e651585c03c3ea03e520646

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