Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4a597a19dfd08b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 14:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2436d825ec2b6f67c5b96f6cb9f61b36 SHA-1: 80736b6fff0a413a9361aa173ee281ba66931f26 SHA-256: 0e4a597a19dfd08b69769678e85a7ee7483b66a68af1978b0308663d5e14e543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/f7bfeeec1a18afb4b81f9dd8ee5b4e9b/18429574080.pdf In PDF document text
    • https://catbasailing.com/upload/fck/file/12125807149.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8cb2e8107eb0572f94fb92b83382cd97/28670224448.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/29675491246.pdfIn PDF document text
    • http://atya.eu/files/file/dajoma.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f85aeac1---43232579227.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/39068840396.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d2c9118c---93052778338.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2007540442609eb2d08a857.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc8cdce37---foxudegibawinofetupukoz.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f6649c1f0abf086597d690a324f11fe2/59531010089.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/56504557172.pdfIn PDF document text
    • https://alev.az/userfiles/file/bizoloworonojetovix.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/80939511654.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/49615521490.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/89415371757.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f30ae743fd---fofuzuxumomufaxetufo.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/ramatedaba.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/9792721043.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/521450979.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/37692072697.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sv2oi2eqa7n45fditp3khbp9ql/ronebibosofijinudaji.pdfIn PDF document text
    • http://jarosi.hu/files/file/dubetedoziwomutenori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+miseducation+of+the+negro+woodson+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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 11172 bytes
SHA-256: 3d465d2a41ab2a7f0a7310f1aec82770de3c07abc4f060f737163e7fa9cfcf07
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 18652 bytes
SHA-256: 37f367f42a7cf9a65ccda546952d96311d74a2577fcb73af24ee25c19c041bc6