Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97fc8faddf3b014…

MALICIOUS

PDF

91.5 KB Created: 2021-06-30 10:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a899b0d56ed5278927b87785d378a63 SHA-1: ea6bd2cf0bd9060ae2c2dc202657cb3ab2ba1afe SHA-256: d97fc8faddf3b01498d975fc1d6b919c3cb566943f3ecd8c4ecd3bb8698e5006
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards T1566.001 (Spearphishing Attachment) as the likely initial access vector, and the nature of the links suggests exploitation for client execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fitviewer.biz/files/file/gafetijoketosiwovila.pdf In PDF document text
    • http://cokhihoaiduc.com/uploads/files/42234223732.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ff82dd6c87c063f7806c43b5faf2a8e1/81007644218.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/687f2535c757c702f55ecc3a629ed4ab/3773868101.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bef9560cbd973c453f67fbd0c34e46e7/zesezo.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/refirodafabekejeral.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vifutus.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160babe62513c4---27108662777.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6c67905c---bexokirevasipunemegewiba.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aebb145d6---dimodometitobefotisopek.pdfIn PDF document text
    • http://acril.ru/ufiles/files/78997635773.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/vowepabunigipigevevuwusew.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd49b84e05e---nizaxamijekeke.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddd617c256---1659178645.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f19c5cbde0a0e98c4af9a48af773fe8a/zajajekazokonulusekib.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/vukepuvetanajesumasune.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/679817c06e5ba461b24dd9184de1d905/27749101563.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/74051633918.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/d28cd8384a4b69hjj3k6ejpr03/18148117506.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/sobetapad.pdfIn PDF document text
    • https://bselink.com/userfiles/file/famepurulax.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/buwubafosuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=board+game+template+makerPDF 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_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 17756 bytes
SHA-256: 2428c4b8e37f0d2cbf36ffc668165f1500e803add0d3bdf8ed305ff67737d3b3
font_01_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14979 10516 bytes
SHA-256: c1eca8c84bb8e8c0f257db332e78679af223bdb84b30f27a90998db71c34a20a

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