Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcea288898e51ce…

MALICIOUS

PDF

76.6 KB Created: 2021-09-23 10:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e067832d7d5134fba688e59675900b1 SHA-1: 7c26f2f3795b10a487dcfa8cc6d6f05e334b1b03 SHA-256: 7dcea288898e51cee6431fea272d3cb9024924222056de1b5c608c3b81abba23
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. The presence of numerous unknown URLs further supports its role as a distribution point for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tc-antey.ru/uploads/files/33600883772.pdf In PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/jakojekijorukexozaber.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/59043779778.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090812495211.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/jugedajakokonukowita.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/84673733298.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/54898735382.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/fibuxedonusatoba.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/bivaxim.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b95ffbb82a---tawojulul.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/runatuvakaj.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/7710867335.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/samodenezozij.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/21268724450.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/nijegigogixupimo.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofanogogix.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/7329545256.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c7cc941c1937714b4b22887633c63778/venijoj.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/darenexafufujuluf.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/565a7692e4ca277e65051935b54576f3/47956471105.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd0c8568bc---saroxabi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a0df75ce3---3835181496.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7btfkbau24mgv1k6vpi3i2kmri/96821884372.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/sixofimaziresasolipuboguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+battery+saver+app+for+android+2020+downloadPDF 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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 11192 bytes
SHA-256: b9ecebd84946279897ecd60592cf8c8c7e4ca06aad2ea69961e285924a99f474
font_02_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 17852 bytes
SHA-256: e4060009f8820cec8dcae80248ccc1780f6f7246375a678857f9a156f265fe8d