Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e67c1bee4a8e93a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 03:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4fd44d8d85720f45689cb3552b65a35 SHA-1: 6aa47c6bf5c986f6e1ed3ff80e636bfda11856d1 SHA-256: 8e67c1bee4a8e93ab54d4113f086db593c004fe4adf8931dcd5fa8a4bf9ab442
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or are structured as a link farm, suggesting a phishing or SEO manipulation attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://electrodomesticaruano.com/images/ckfinder/files/39432118280.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/068dd3e5c82fa8591b2af39c9f4d8532/dujoxiwiruzoruvujamujug.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/22435818758.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zumagevelalukadizefix.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef5f2bd31e---vuwoguxugedopo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c83c8b744513b9b75b88def98a19d9b6/64831686654.pdfIn PDF document text
    • http://vkts.se/userfiles/file/60520457698.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125050863da7---47157519765.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb8f03c7fe---17467956366.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/nataregot.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/91681677459.pdfIn PDF document text
    • http://progetec.org/userfiles/files/losimusavikufedijolanaz.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/16970759471.pdfIn PDF document text
    • https://go2germany.ru/files/file/16381837547.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tasiferijizinuvekozux.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/12c32a5dddb04fdc2f8dc21368b0a61a/95462690017.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/70405358128.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021618256576426.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/tisinukexugesetikamon.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/xerus.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/toredenupamoxu.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108080441271549.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/telutoged.pdfIn PDF document text
    • http://king-tableware.com/uploads//files/202108071012565577.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/lakitulofejejupovig.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/xebuxavikirirudapeleli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=turbomachinery+notes+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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 17412 bytes
SHA-256: 4c143e02a413803896770983c37bbbb7d22c4333ad9a37b6ca860b5df66b6f89
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 11156 bytes
SHA-256: ea0ba4058b7d216aebfc4b97c243d01386ae921d28ec7be692126bf5f43faaae
font_02_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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