Malicious PDF — malware analysis report

Static analysis result for SHA-256 175f9868ee49c55b…

MALICIOUS

PDF

80.9 KB Created: 2021-06-18 08:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d73bef7ba2aefa5892c2785187bf24e7 SHA-1: a37f4f86d2f960a5aea6d93145487f1c29a983da SHA-256: 175f9868ee49c55b7717cfebd843f678eef84d926e0c944f5dc8b151ac2f5575
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various PDF files hosted on compromised websites, suggesting a phishing or scam attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malware distribution campaigns.

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 https://ngoctraithaibinhduong.com/uploads/news_file/kesokuzuwifixuvaw.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7751bc854---56991713534.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xajotetezenotolozizagorak.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/12873474329.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0067e896b43be2ea4555bbca8eda0f6/tumivirobanipezik.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160953b4e011d8---7918429533.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a33dfdab819---dakudazixesi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0669ea3a5a---tirularoni.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6957eefac48af821b32e1b36e8547a3c/87747000862.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/lanonevukug.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9ljpa7vm7e4ke9sf6mm0c70433/pivukukozigodave.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b752a7941148475777bde0a036eb7d7f/63845312746.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6eacd7fb1---9470655599.pdfIn PDF document text
    • https://windsbs.biz/files/file/pilanus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=marvel+contest+of+champions+mod+apk+unlimited+moneyPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/26027619779.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 5508 bytes
SHA-256: dc4845532cfa6bdcf82ce7b27bd4966462d0a77d4825a46ce0b496c954a2062d
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 11784 bytes
SHA-256: 51ddd53a8620ff0f5dd687eff7493a0ce7a542397f56071de589ef069d3a7293
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3