Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bc66394cd48426…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 18:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87d2f03584e13fbe9e3d05fc598e1e8c SHA-1: cd639690bbdac41a1aeaa878368367bd46feb6a9 SHA-256: c3bc66394cd484265fe873c278ad1cb9c7b72881d0d229cf15c4198ac35bde7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=formal+operational+stage+piaget+examples PDF link annotation
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bovewukipegosazitevigini.pdfIn PDF document text
    • http://precisao.net/files/files/voguporo.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/98063964903.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/59905019307.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/23118140466.pdfIn PDF document text
    • http://coachhouse.info/assets/file/96462976111.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/lisabemivevogenuxadudazo.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/lirevetivajuja.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/xixikakuwidedavawudi.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13564739085.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/8865776844.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b55bf58e8c---68737237285.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/vewopajesaduji.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f143ea63f4---zebaduxurivem.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/metepofokamadu.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/47632687158.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143518345777---62371259952.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/mudofanaxozulitigona.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/mitovorexi.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/15457359757.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403d807a7aa---5736860045.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/18653501611.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/xurofetusiwivaxoraxowafem.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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 10676 bytes
SHA-256: 7c75852480a72cf7394f71d9bc2a216868509e7d737427adc045f32721392b40
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 14944 bytes
SHA-256: cd41550abf7119230b22158a8cf825dab41eec2846d4715f94b773b4875f6022
font_02_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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