Malicious PDF — malware analysis report

Static analysis result for SHA-256 44334015ca4da5c7…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 01:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29561c1be508e34fd97d149fc052f14a SHA-1: 0e7ff6444d87af5a9a46094f0a9c9b8d737c12f6 SHA-256: 44334015ca4da5c7b92ec18993aad41b1e2f6ed68d61e9bc4b0544783188b745
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also features a link farm with numerous external URIs, many of which point to other PDF files hosted on potentially compromised or disposable domains. This suggests the file is part of a phishing campaign or a malware distribution scheme, likely intended to lure users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://rux-thai.com/ckfinder/userfiles/files/47833678965.pdf In PDF document text
    • http://yuha.be/_files/file/zarapunosat.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/dupanitifoxabigu.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/59788368093.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/77440651402.pdfIn PDF document text
    • http://groupkaishan.com/d/files/31484206121.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160791e3a297b1---pikasava.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/7155123881.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pcpkq68c0immvb1deaujlrcr02/sasawudula.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/27602724325.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/sawukikagagefakopa.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/kasabivikituxegom.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/eb0c0f1ad5823f52efe05ebf27d50d0a/99978516644.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/61964053993.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210619020210.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xuguxobaxis.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/3913428277.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tuliwetufasega.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772743e2b1b---voragabegusi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c4093a92a70---56585642595.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/41507562552.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cafff29bb---63939269089.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/13jr3nm9at0814bj1o70ce90mn/84185229930.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/63068342928.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8995305404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=genie+pro+98+screw+drive+manualPDF 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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 11244 bytes
SHA-256: 6de045c863ea00b78c344dc669963bf3f7c2594dd08b19a8b8db9f78fe82e374
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 16688 bytes
SHA-256: c8732cd2b9ff597601a27f91b6b476c7cbd25dd599d122cbd5c0cc30adb2c0e4