Malicious PDF — malware analysis report

Static analysis result for SHA-256 8342c8d18d4ad00a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-20 00:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24a37ecc8af41dbcbd50c3ae3ddac065 SHA-1: 27bf739211d7b661daaa4c2398306a786197a343 SHA-256: 8342c8d18d4ad00a29059c8151263b80d3ea7ff863ab40cf82e956d24f4be13b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://stallion-international.com/userfiles/file/54886631226.pdf In PDF document text
    • http://savages.lu/imagesRTE/files/sifititidezomeluba.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/guzonirepu.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/47289707624.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ece21d5b---69441238585.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/digenezabexaxuk.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/madosololir.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/33690338655.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/kinenumizitagoniduwin.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60b93411b8---ginemosojowumogizuforufis.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/26792646469.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s11jphu9f6e6n7qhko2evgevs0/8024187428.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/67fc80df9ac146903c0e9b96419e5b9c/pizomapaxulolopogofekob.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/273f81b273389ec9c45f62f9acd208c3/xivizavuduzerejepisekul.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rogitilikakegawasix.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/kevifonosigivamag.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9dee5199bcede09efbce033ea384a1af/ziforiwizuxalutuviwi.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/55370331431.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/nusufuzozuwamogupis.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/61282694071.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc735f219e8---48142833402.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c3844059505---burigijado.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-08-11/380b694c22de87c358958d3dd42eb0cf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=why+was+latin+america+imperializedPDF 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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 17848 bytes
SHA-256: 2984182aa8d93adcefdf98aa8a2159806f03a7424b186fce26ff7dd47d10a067
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 10912 bytes
SHA-256: fb77191286e5df23e4489ff45ae4da76bec6bed571471cfa79d793ce1c0aab31

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