Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec33b01ed4e554b7…

MALICIOUS

PDF

80.9 KB Created: 2021-08-20 17:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 707e6cfabd2e44e79837813cd5848eca SHA-1: 495779f79292e4a2f6eb5bcd0d7eed4aff7385c7 SHA-256: ec33b01ed4e554b7b4df15f61be4bb845f2a30e7e6e5164291c58e05d73b3681
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://worldmedglobal.com/userfiles/files/wifexegarumu.pdf In PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/40f14e33ca64f07ca3c01ab46d23905d/zilusipawekoriwokodaro.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/xabiwipinemefaxebusixefe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160902e5d56975---koxumavirojo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ce0016e0b7575727566184ed80e858eb/rufuki.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/bowimimosogip.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e97f0fc78149486e916cdf998d600816/juwexixexakurotetod.pdfIn PDF document text
    • https://atl-50.com/files/file/18479294902.pdfIn PDF document text
    • http://93564497.com/userfiles/misusetunojixusinujidewe.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/da6fba2397818f271a5b0cc3ca48dc23/94756803577.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/peravasarulelivor.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/73895887952.pdfIn PDF document text
    • http://dzbnf.com/upload/file///26811458954.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/dijejenerumoxebev.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a23344f7---pudolamofelepebibakogina.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/27736017841.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f9cf4f2956f87778447dd0bedfdb830d/tevomadexofo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/73874014cc4910f39e329da8b8f6f4f0/fixupij.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84baba7755---71140066919.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/dubokote.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1c7abc3c0ce68238bc502aef6ae4b8a1/vororepibutesawanugowuzet.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebd2cd7de---39344392601.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609653ccf165d---volaxedukisabasefuboxalow.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7520cefa5---25983658586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pythagorean+theorem+example+problems+with+answersPDF 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_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 11144 bytes
SHA-256: 2facd65ab7f9f6c71512a5e0a41a8d3261aede5371146779ad9caa04a5cbef83
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 16472 bytes
SHA-256: c5ec96146ead57f631b289a72f23a1f670759db235fbd1a65302435c50b02413

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