Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fc6b8cf8191ec5…

MALICIOUS

PDF

95.7 KB Created: 2021-06-28 00:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c033233b47140db1c041b89f506e495 SHA-1: c5cb757a2267fcd0d07e467febd17a748b2d793a SHA-256: c8fc6b8cf8191ec5e683039b24b1954d6543adb76c90480c6d617902914c15eb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised CMS platforms, specifically WordPress sites using the Formcraft plugin. The embedded URLs lead to PDF files on these compromised sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160838a6e0aa55---kalez.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876a8e3229e---43009921223.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/doligujuvemaluwijugiguda.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ellmc8ev31rs6i7t9ukjgv9t21/polafiz.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/giponolabafejexil.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f20f8e992---96994273530.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/nncgvr1b6n09h37j9hcvfff25a/gaxofogujifosibi.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/jezutu.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210627_A08A95778636192E.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ftd87eh51rbdegct8fdnoug3qu/buxumabuben.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2b428d0a---jukefakusixalasebasosiz.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/sawasawekavuvunubumaga.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9545de7bf1---9125315478.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac93f24522---96988419230.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/52828988573.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3364aa434---dikak.pdfIn PDF document text
    • http://fotossc.pl/_files/file/67669580544.pdfIn PDF document text
    • https://ahha.az/userfiles/file/86610301365.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090fea3164c5---lanamibofibawaluni.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/91317099134.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b5819f50---79631159496.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/17369355188.pdfIn PDF document text
    • http://springbook.no/files/2731267487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=luffy+strong+worldPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 24616 bytes
SHA-256: ca7bd07870180ee5216057055f1ea9c642d1bde92067db017ea9b513f95bb01b
font_01_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 1712 bytes
SHA-256: 9cfc14d05bc0ea5752009a074e0e00cc6a3c4af0d39c0e775e54c99106f5476d
font_02_sfnt_off0001404e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15865 10400 bytes
SHA-256: 7b4647b9016a2428a577ad248165ba4aa4c7417a300bf3f5ca32c3ec0deaeb4d

Open this report in the interactive analyzer, or submit your own file for analysis.