Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4781b4cec003060…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 07:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 07587ee4ee823feee7f3cae31bb34491 SHA-1: e5ce68a9c661c7446764df760de562198954aa2b SHA-256: f4781b4cec003060452a7366a1e19d7f1fed0acebb093d4174b5c372018b02a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://resetimpianti.it/reset/public/file/lovir.pdf In PDF document text
    • http://lepetitjaunais.com/userfiles/file/baposezuwekepirofuzemeb.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/45442555158.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/17726761615.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142bd758d6fe---92187828111.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/33822899751.pdfIn PDF document text
    • https://temahr.hr/files/8276939314.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4061cf97b---40020747446.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/11847888854.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/gumixejawewopo.pdfIn PDF document text
    • http://tzsunup.com/upload/77737513734.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/polisarakewi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614853a8050c6---muwesewawoviwum.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf7dcdaf5---94388237547.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/filufunon.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/69562309089.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb12cb15c---sevaperexotedisawupe.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132e325d8bf2---zitukusijexikifa.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/37807855201.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kejodomevokudigusekifu.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109220657187053.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/tiris.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/48779498351.pdfIn PDF document text
    • https://cet.sk/res/file/18869945609.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109130920394435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=game+turbo+redmi+9aPDF 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_off0000b1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DB 10540 bytes
SHA-256: 63069f8f88902e939fcc8559d101ca651059aa2dba25ba2e71df7994fc5667fa
font_01_sfnt_off0000c9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 16816 bytes
SHA-256: 82ee7dc4f988e3f841556537c34494342fc415aa86e15056b43cd0331964b9c1

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