Malicious PDF — malware analysis report

Static analysis result for SHA-256 2199c3425a66a4ce…

MALICIOUS

PDF

74.8 KB Created: 2021-06-20 12:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 43a51d7d4d7e95163b781b939cc8dcd3 SHA-1: 8b0954973b26a499acdc0149bc4439a4be15abf4 SHA-256: 2199c3425a66a4ce2c606b11b18cd15f97f9594e89380c042d920b2ff09ddcfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content. The presence of numerous URLs, many hosted on potentially compromised or disposable domains, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://curry-box-deluxe.de/userfiles/file/bidawuge.pdf In PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5f96ebadc96a2162ca48bffebd8be3af/xudemozezalasuxojosi.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820580505b1---rofolutajitidosanajegob.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/55272854529.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cd9924e7---28472188281.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/xumax.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070288165fb7---73775666761.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/kosiwodozazurojasa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/peuhmccc3fl57jeh6lknpi0m88/rapumakepalixopimo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae26cdcdd---13518406661.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c328ff53e48baf1ef5b55d38362daec9/ruwisonapotog.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d53e5c49---776266076.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d2696d409627212246e1a3e42f379c7b/duvujatafanum.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/3778008060b80cfb563f3.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4svpkq2vki1qe278jclfs78ds/nefiwotonefisovagudob.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/69679406387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=convert+png+to+jpg+without+losing+transparencyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 5428 bytes
SHA-256: 3ac5f03cfa876cc2dadc0e186e250f72a9b4fc5b84e50af210f7685e83c6ce73
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 11324 bytes
SHA-256: 987b5525fd1360c6606a0f55b13ef41122b2602d37c27a2fd2f4c5fb2f9e0491