Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d75bc945f2dce9f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 03:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 956b323b2fea61ddc4a2bacde43ff7d0 SHA-1: 1770ec2771c58889c827e042f3bb3b91532e8f3b SHA-256: 8d75bc945f2dce9f293094dc7b03006ef044ad078537d023110058a6fdc1b08d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, likely serving as a distribution point for further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea6be725d---sufiretatopebix.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/20990672702d65bd8cdb7a6806b0edd8/fosaxowomobiminutu.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/tepunusuwatowozapotig.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/wurewepefukorumurumaxezem.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/gewos.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/89254714483.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b2c349ef36e3201ce8b53477f8cfce67/25515055703.pdfIn PDF document text
    • http://prestopc.it/upload/file/40921909541.pdfIn PDF document text
    • https://roshindelivery.ae/userfiles/files/83104544302.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ee711697---83782316513.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f964f1e9ad---kapumekaxavamemapijuz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093be4ced7e4---22123703903.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c847b6b0---runifokuvavojew.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/peguzipotezilakavixiju.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/wepatizitisadozawutitopis.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608cce684c128---magorevutixipovefakov.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/tulupebeluwobiki.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210621_085047.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/pedubevifuxem.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/84030965019.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a792e0bb666---pidadolifezanilup.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/44694659553.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/54445464301.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q1t0pvp9db67rpq97s7ob5lv4d/gariti.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/mewotiku.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/11793060543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sochalay+form+pdf+download+rajasthanPDF 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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 19656 bytes
SHA-256: a32f14428da0bba654f7f299a691b1567968dc7fb19c6b4a7705be8f7183bb3b
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 11064 bytes
SHA-256: 3155aa5726bec29d8149524834ab9bf57ad0b85b7fafaf4be35f0c11b030ca38
font_02_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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