Malicious PDF — malware analysis report

Static analysis result for SHA-256 8373dd273f4fcef4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 05:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0f2ed6eca7de29f0dce1249847f43e7 SHA-1: 84b4b2879b0395aee0c36564ccbe24bdf339af07 SHA-256: 8373dd273f4fcef4ec7b9375da014934f845b50b11521bf1a47a49537f5c2a78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for phishing or to download further malicious payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://albertf.madteam.net/ckfinder/userfiles/files/63271577325.pdf In PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/27629181810.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/48734286070.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d142775cd---93660214413.pdfIn PDF document text
    • http://darstin.com/userfiles/files/pejebejoten.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/30659931475.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/rorebuzis.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/52509261425.pdfIn PDF document text
    • http://fivelscope.net/fckimages/jewavukifeniberovixuveka.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/baweke.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/xomeponedekuwudidiruteg.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/gefebixaxomu.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/59644992948.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/37787321727.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/zukufaniveropaguponi.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/mamudojufijogajezo.pdfIn PDF document text
    • http://glassick.com/userfiles/file/lewivan.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910075501592764506.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/silixugevetojoz.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/6173536422.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142907058c1e---dovewiguxawuba.pdfIn PDF document text
    • http://pjteam.hu/uploads/47575027084.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a237b091ad---32348648180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lulubox+app+download+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_off0000b5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 16524 bytes
SHA-256: e4b8b4390f26bc1227abbeb6f3584e0403811111fd05f4fe4209614bb4058a81
font_01_sfnt_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 10372 bytes
SHA-256: e6ff751a2e8e784dee5b5e3cf29be01cc17729b70ea7fbe1216fcb9719252b1e

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