Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7b399dc0aefaad…

MALICIOUS

PDF

74.5 KB Created: 2021-08-27 23:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b07fd970472d11399389f241fc42fc6a SHA-1: bdc8d1b4321096bbbd0aa402c813d1381775394d SHA-256: 4c7b399dc0aefaad61e91a915489dfce09cf15cef19a91d9ae6a90ebe53f9c59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=lay+analysis+with+an+introduction+to+proof+5th+edition+pdf PDF link annotation
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93843d17f3---97230023446.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6cefae9c4573511bd0d879d47f68960c/xovarekegisekubibofamexa.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zavaxuro.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/gaviwivujo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/snssu6hq4ldacou49fm51ci556/wovavedasux.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/51201736724.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/maviresugi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dbf7241c---9466766901.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/16234857142.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/42943885183.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161253e61c27e9---34195178355.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qtjdmnkbmiifjhrcsqiob7r87q/fowerupipalar.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/25042887023.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/jukosisos.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jjfs3218tgs3quvhm82bn823i7/46521670713.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/aq3vfjfjprnshke1a2c95cmuhf/vapatujurulonaniwomisi.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/93400820095.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/22388333187.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/83059277359.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5kfndh6tvvos6c75in6gibja0n/kedabebivotabemososukigan.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160868b852274b---dowegabifuworigaxorin.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb31930c95---rusupiwimepenejuro.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/xafugaxarezixodanesupe.pdfIn PDF document text
    • 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_off0000bfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 11108 bytes
SHA-256: 4846537da826fccf990a1637175337f953b1ac4e77ed7532a1768913b4b5af21
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16224 bytes
SHA-256: 16dc4e32ab3923d22affd92ddc42d12b011e037f3366f8811b89981e12184181

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