Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fea79e3cadc410…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 00:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 945c37f35c9cdd47b6bd5b3f51c1f1b7 SHA-1: f6ccfe276a6d2ee1d2edd6f3db8c1cfb4cdbfde2 SHA-256: e4fea79e3cadc4102056af22169c625447263b26996be8994b7f7bb9c3414d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6ede1dc2b02f272de0d6e2ed9b56a4c8/vifowizovipulefewip.pdf In PDF document text
    • https://aprilboya.com/userfiles/file/bideli.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/ranurimemigubonaxu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1908b860e---70286690970.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/muduxitisanogazikipiwimix.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3746140058---fuzezon.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/160491285.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sorofezeviwoge.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/lunufuwisatebigasa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3220c03dee---53406927852.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/17605310066.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/73376444012.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/13300229911.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/887564a5b8dcff42e3dea3974a07cd25/fedisibape.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/77311616817.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6a6b7f5a---jetuzifupu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5f1596918e9ebba32dac483f49d35e2a/44195477566.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/diwuvuzoputujabefudilaku.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/55885465262.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/2970300204.pdfIn PDF document text
    • https://ms01bet.net/contents//files/lovegigefot.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210602/210602123820643710jvblzgoy1mgf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=durability+and+permeability+of+concrete+pdfPDF 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 10968 bytes
SHA-256: 2b73ab35695ac3ccee5af6f79748b724308c9ac67f9fb9c23737bdf31ad9ea0a
font_01_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 18884 bytes
SHA-256: bea50abda44b345315e1520a7b763e1b7b6663e7af4740b20df293d26ad5c43c
font_02_sfnt_off00012ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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