Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc3c811b7cfc143…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 15:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 679c13fc83edf50435e729f3a9b00522 SHA-1: 272947c46f3caf1bd7146ae6707d8d5aa05c4c04 SHA-256: fdc3c811b7cfc1438ae12582cbc5e090f02b4e7bd94bd9e572472ed7836b47da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://coretry.ru/uplcv?utm_term=roblox+fly+hack+script PDF link annotation
    • http://ctnphrae.com/ckfinder/userfiles/files/30807097497.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192172681895.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/82701120195.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/tugop.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/denapavenesegip.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/baboro.pdfIn PDF document text
    • http://rhondachem.com/d/files/vidisotunexoraxovejugakug.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/takajulidadojig.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/57620438453.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c4159df5cf400fc36dd29ee7b8fb9f7d/nawekizus.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/67004006077.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/zamel.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/35581066235.pdfIn PDF document text
    • http://popmetre.com/news/files/32140811598.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/99033595325.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/bolinifa.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3166128---347908953.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/zuralip.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/16361672618.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/54014189344.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/40eae64fb8b0a2bfc970391beba16213/ponejapoka.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/96851343303.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zisapotubavutafosozo.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/zugowepajuxosujirilara.pdfIn PDF document text
    • 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_off0000b7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 10836 bytes
SHA-256: 3ace8dfc577516b9486d4f78cc0afbd6cade114cb71563739cc00262b50af666
font_02_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 17908 bytes
SHA-256: 9488238e2788f21591a5f0403e740cedec217c09d8863e4ce487030dd5c98f9a