Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27b0231255093bd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 00:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f10f751e81de6d9f8d15d13fcca8c700 SHA-1: e0341616b241f6556b1a46eec2e9c0fb45f5e921 SHA-256: b27b0231255093bde0143b65931d7fc1988f3bf42af6adbe661ac4cc307e046b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable domains. The presence of numerous external links suggests an attempt to lure users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dgkno.cn/upload/22686373636.pdf In PDF document text
    • http://aybar-gallery.com/userfiles/files/gokogewadenuwilemubalok.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79913707d---6495439348.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/16065134522.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/zosozarivezebiv.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467b30ad02b---48892634975.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/kixanozojezowelopuzozip.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/jozuvetebefemalafeko.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/dulexigepu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152141295a5c---44727813767.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/zanetoregulivewipifawelit.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lidalolabosokowaduveded.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/80729407170.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/44695578699.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/raxuwiwadilirupu.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/xatemawinirisure.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16135ade3321b2---59100804036.pdfIn PDF document text
    • https://ijp2.com/contents/files/19745312332.pdfIn PDF document text
    • https://badoza.net/userfiles/file/59241853332.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jarexuxoxaru.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/wekajezemurasetur.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/84295534038.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/zibonej.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/nefagom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=index+of+two+and+half+men+season+1PDF 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_off0000b0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 15764 bytes
SHA-256: 78092398780708b81d2e4d2c591fe66814d8ba4812b35dd85a68b19d32128bfd
font_01_sfnt_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 10616 bytes
SHA-256: cff6e1fcc755c7ce3622d5c6fe906e01f7587eba2f5711b28aa00ab9124145e6