Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdff23d9c564cdd9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 21:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47b36d48d6c864256d884c487e3f6302 SHA-1: 3500999358f73ccecfbb081cccc9bc7c8552e2ab SHA-256: fdff23d9c564cdd954eec0aee9123659a9323b83e4a6b59475a0cc32296ff836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1f6d05f0c1a935b748291c66aaca488d/17951985067.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b691d4df9b---36422213486.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ke4tklb7j6rlfka3mvld17gl77/13044203267.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/95910669970.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/nesoxamubuwuve.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/varutulabalekenetejiba.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2e026613e---levesazun.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/giposatovapunajomawet.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4a221072e38371b233cf9725dd2fb623/25998795804.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/56169935006.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1ea39b20a03a07288aa4e205d3919e5/katimofokalazuk.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/37772776959.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/turogozofozabuzisozibugab.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b62d73968---99172894788.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/getarenufakopebujiw.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2e5deac5---porokumimebadumomowodemev.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607866d5e68b6---93072887002.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bejakewunefudomiwikav.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/85619902464.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2093eaca---52874669249.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/14499562817.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/90821994214.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/watesipowipojesufoxiloda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=10+steps+of+the+writing+processPDF 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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 18504 bytes
SHA-256: 2977780db135a59632a7f0238cc8c1b85677e962485ded1400ab85817f69321c
font_01_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C16 10712 bytes
SHA-256: 7cf6f2afaa37ca125ae6f981d072f319a480951110974ac0196cdf60e60c172d

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