Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24be8f780ccc778…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 15:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a5b2830d7f81f0dcba604e692e603f52 SHA-1: f45a61e3dc4c71a4c5c4bcf97566e42967ea7822 SHA-256: b24be8f780ccc778c8629b891e9ce2cdb0629ee858c3721f8c093d9bd86add27
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://emotionpicturesfestival.gr/userfiles/file/93716377548.pdf In PDF document text
    • http://yuanjiangchem.com/upload/files/gofovujulagarazusavo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e896ad72b34fe28e94d590e0aa3af95a/44640594247.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc3b09d06b---sefanevig.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/sepegepofosabef.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/1735668310.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eefc7bba6e---fitidagibenisutosewi.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/pariro.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/46593049295.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/83385973287.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614224d27f9fd---14620300581.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/jaretat.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/xetekeropojoremure.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/57141802058.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/mewinuvunap.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9295dbeb---59608287549.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xoworaduzowerobana.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/66336193913.pdfIn PDF document text
    • http://fygl.net/uploads/file/180408044838.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/jafedajali.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/19537582319.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/6827986906.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/bexulokamobigumuz.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/72030029442.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/xopilusobekopuduxijogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rar+extractor+androidPDF 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_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 10296 bytes
SHA-256: 1c1f9ed73ada1226e4e4e5c9d0d7bdaecb6e0b9175ec04dea1a478bf0c5358a5
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 17632 bytes
SHA-256: fdc9a7fbab51ad0388ac66fa5f0386570b3cdd7f7abfe984b3b0fd419c4ee4e6

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