Malicious PDF — malware analysis report

Static analysis result for SHA-256 02dd93c31310d220…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 11:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bba24352c707ebe25b8898183ee8a4d6 SHA-1: 9fedf7bb1ca26656e7ae093ec3172e0e1b614cd2 SHA-256: 02dd93c31310d2204c86d37b31ef362ba7b93f1505afdc323df89a8139834b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://platypusspot.org/uploads/ckfinder/userfiles/files/fabikonozotolakig.pdf In PDF document text
    • http://fujavietnam.com/images/Download/9853652677.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/tojiwitiloxenuxuwaxo.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109031218345722.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/70747833905.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070323e7f94c---75265536653.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/newen.pdfIn PDF document text
    • https://mmszke.hu/files/file/31921863736.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/madoreveposujekobaj.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/64947440799.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/vupanibopofamotavodefupu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1b09b19320c4c06cc224a5fe016ede7e/16616249711.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/afbf1d5e9cf8009900efd52ec7c735de/xaxire.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5744979ab7---81966164192.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pobufineme.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/87548320445.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/175061236130e65e14797.pdfIn PDF document text
    • http://skupka23.ru/upload/m/10849944096.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///mefuzubilixajadanugizumek.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/narinebofuroduzoze.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/q6nipao5n3ksjfqt90sd73kb3l/69228489904.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16073d06191ff4---dodikumojewepidesez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bounded+rationality+book+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_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 18780 bytes
SHA-256: 4efe8bf6882d7ea424404ba82a5fe868c06b200c70a8cb830261b7bf2277aa10
font_01_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 10824 bytes
SHA-256: 51b8111763ab6920735ebf947f6b0c9e9c2d6c56bf08beb16e04d4d211f25784
font_02_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1