Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f86c94e3bea932…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 18:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d4409cac0b50dfaf425c0e1af73c292 SHA-1: e73d98d4ae69924d5b8b6789014fbcb343fcf38e SHA-256: 37f86c94e3bea93275a6a416d4a8e0afa9d39240b7aa40475039b342a723663d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely as part of a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and within compromised CMS upload directories suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff54427fb2---54775731741.pdf In PDF document text
    • http://condosworld.com/abisol1/userfiles/files/lizekagegesevode.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///mumidilo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134343e6cd73---zubusojateze.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bufamusalalesipaletisex.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/39853125823.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3c93f1921413b65ec9dcd2564be442cd/9290351302.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/kopoxolivotodatirun.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/misiwes.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29e7c743c40d09ebb0aeb99cdd7bce5c/tuwunozipasajinefirege.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/nasufazuniwipin.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/bavetavufek.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/59286538667.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/vudozewiregade.pdfIn PDF document text
    • http://myredm.ru/uploads/file/nakexedewesavunupobu.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/73580635924.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/eirmituvj5jsuiqj5aophimufg/bonixanalogitebozizegij.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaxorijorovol.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/viwogereju.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/99285508055.pdfIn PDF document text
    • https://somogyplusz.hu/files/dudujuderubawatemotuju.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79554895642.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/96315702260.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/mofaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=a+quiet+place+part+ii+torrent+downloadPDF 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_off0000c2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 17288 bytes
SHA-256: e9d4e4c1a4f155bd279fca20dcb0fdcf828e58380bca5e9f7ad97cc7863db4ad
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10652 bytes
SHA-256: 4970b2a78ce44f41489537c6ff416a7de0f02ec78bce469ecbcfb2ba8ca734be
font_02_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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