Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf63abd124d8071…

MALICIOUS

PDF

75.0 KB Created: 2021-08-28 01:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6818b6542482a81bac342eae15473b2 SHA-1: 9bcde3c63e3df12ab0d6880f9f7ff5460e9437fc SHA-256: 6cf63abd124d807107dcd0c6b11d2080b1233b884c102b005e7df1b96342c5aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further indicates a malicious intent to distribute content or phish users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://murphysbeads.com/clients/54316/File/86919132548.pdf In PDF document text
    • http://talleresjpg.es/img/file/bejuvag.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/24435655662.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160def88e27ddb---94380134337.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/64818432481.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/datedozavi.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/volixu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0ea69a089ebc6b9d753fa968f90ddd7e/vebafajunofareruxe.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jimifufinimidusewe.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/wamududijezunokikipoxuma.pdfIn PDF document text
    • http://royalgroup.at/tmp/64269300034.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/basusitiru.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/adc79dc51303d1ace2bb258d39243d3a/50084093410.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126c7d753a4b---tinojuxowelapekufab.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d115094520---bixuxolusolaw.pdfIn PDF document text
    • http://tencanpowder.com/d/files/nizumu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/78392787473.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kimefewawalejawolivilixa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daca6e4518---14251514807.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/veler.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/90907537689.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/83214858940.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ef0b879b4ec291c8673eb00a4505a7e3/fevaf.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/33fb54cb3c16749aa005a7ad5c7c2cfe/rudulobekaridefosunaviro.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe1b6ca2de---3226390412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+does+gb+stand+forPDF 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_off0000c10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10A 10628 bytes
SHA-256: b2de0fba100c65fbce3c679c0e9848e34113bbcfce6d466a1d4fae2b729eae65
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17408 bytes
SHA-256: 5e6f53419ca1b2807cf448c598614c83a9274a6c5d84eafed15293568a55efe7