Malicious PDF — malware analysis report

Static analysis result for SHA-256 3364fda5ce10cb32…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 09:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e402e3d5cfb934377e0a66be35ca67f SHA-1: e28dd36cd4c9c8f6c06a2db4903a80174feacea1 SHA-256: 3364fda5ce10cb329706317065f283f42d2bf37ca39bc6ce5efd93ed8cb2c35d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://echipamente-scule.ro/userfiles/file/notudavunezivejodinun.pdf In PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/83007102867.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f1e01aa1a7ba1dfcf166658c971b9ff6/61729262152.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/digaloluruvunojojoreko.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/vfpagtboku8gl215fphnin2267/viwemurimefetu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/53711688595.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/dolesixojudun.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d3223d8b53bc761cfbdc43dec584a2bb/kegewirinefusatid.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/60c4a510e8c9ed5c66180f90704d39b9/48489531396.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084651fa24f3---93300715720.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4724bcd7---loxawiwifasa.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078557601531---61578315859.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/51285747335.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/67092038226.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/24408585573.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/fujedigukuwajugolipivotof.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ar108ctg3r2rnasd5hn1ooqt20/55875696754.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/56475443463.pdfIn PDF document text
    • http://poorclarescork.ie/images/vovawijiwipalite.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/selodolaziwirarufowisumas.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/82020326055.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/237e67eb633af452338fc68adbf1a612/20615603522.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/91724f4945c3255247dbb327e0406542/rajivonawirudosa.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7240a0ed3---13606293408.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096a038e0bba---11072325544.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8a45a76d18704ba352e5f6420fae9792/71623530715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pattern+programs+in+java+with+explanation+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_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 11332 bytes
SHA-256: c3cd50101755a7fd60b766605c7950c16c4898660823c13dd96d30997019f441
font_01_sfnt_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 16272 bytes
SHA-256: 1800d21093dfe3af86ab3d4f7aba263434e48517db68c03dd2ea228b1d1a64e1
font_02_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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