Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc50f6aaf850383…

MALICIOUS

PDF

102.6 KB Created: 2021-07-06 09:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 94fe3d2489447b619808d03c192255e8 SHA-1: d0ed441c52fca1af347653f4f815c94739c4e6a9 SHA-256: 1cc50f6aaf850383d834297f31df4803fb02a461499335f844bf2f2a82c9b02e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the structure suggests a link farm designed to distribute traffic across potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246791ed84---jegirivigarirakemuporo.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bp1oq1e5bd9giokg6cebli9r2q/kipoxuge.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/clmarmeflguc9mrvq2rs6pfh4i/44284006647.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741899cffc2---55610302691.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae6226ecb---93687311711.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc327079c---mivewodalu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc08c90bde---rutipoweki.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a568ca03dd4---libejutimutewiradu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/87759248389.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/duniwuwo.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/76285625164.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c90b924b0e5dc98fc797dab8aba90334/kijezozapopunosagirixupuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3674cee454---11352138412.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/69320100589.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060918124373499.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd4a4c084---midubigebenowadebuwimivog.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/51952520306.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/zetipuzolubaromuzo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/dadegepe.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1748255a---seruboxifu.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/44182880338.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3331b65f4---91016493026.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/10001918335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vce+to+pdf+converter+onlinePDF 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_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 10316 bytes
SHA-256: 831b74c8d121003b522ad0e6e876cdbf09d05e5b943b425aeea63baf8281121b
font_01_sfnt_off00014092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 21272 bytes
SHA-256: a84d98cf3dd2444ffb574e9517965515caf483913eb8c45fde26697553b6090c
font_02_sfnt_off0001751c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1751C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1