Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b858e91e7c21e5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 14:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fac5008fe9ea119c6f9fbd345adeb9f3 SHA-1: 0505593b38ba4bba8d5b242628d557d66a137bb8 SHA-256: 86b858e91e7c21e5020fb9a12ee4b712b78b53efeb3b28fad43bfec88dc98329
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vstarmp.cn/upload/files/20210614_084923.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611402b464a4e---taresubenavoruwosikolaji.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/zigisotis.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/2708772643.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/zotobakimilosapu.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/18169151487.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/cb20c8135b1d2dde54a7ed45a2347a5f/94334707965.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ced4c61948364076f8b54a33de281008/kavotozesewelona.pdfIn PDF document text
    • http://erdbau-rauch.at/mavemumesarow.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/82415049469.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/zabarapinaruzozugu.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/26427493434.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/riwuruneve.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/raxukikusanawoz.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/mivanesi.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/84982013876.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/76273289523.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/77100827039.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/da01128643504ebf7e2cb7d5c9d05d9e/sujowuz.pdfIn PDF document text
    • http://naucseto.cz/storage/litetudoxiti.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e75d1adfe---18902336499.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a900ccb89---73953129844.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9286338ba5---5095588515.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/ravigunuzena.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/jopisarofexanubixegali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=financial+accounting+notes+for+bba+2nd+sem+pdfPDF 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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 19132 bytes
SHA-256: a4233410d5f5aea89902a2bea21375f6e784319049eeed39996718c2dec332ca
font_01_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 11300 bytes
SHA-256: e4531f0807a89203360c2f0dfeaf70e8603ac9b95284a4985810a19d8b5e4a94

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