Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f9fe461da9db5f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 09:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 817ae0f795f6e580c3bfa437f953a659 SHA-1: d0e7c53ae6b88b66a6b1940acdc646f2172d4296 SHA-256: e1f9fe461da9db5f0cf4fc7cd3515c2f2ee51bd19e5ec5b6b5a4f455b4890c9b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a link farm on disposable hosting suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=baixar+google+play+store+para+celular PDF link annotation
    • https://cgeminfos.ma/upload/file/tazipixex.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/9035298357.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/fevotiz.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/65271881385.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/24315642907.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37e1e09b9d0d9909df23f5eb719dcdb0/wewuxuve.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/53044873233.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/masodofun.pdfIn PDF document text
    • http://nktrading.qa/file/files/vuzonazaliwusu.pdfIn PDF document text
    • http://synowka.pl/galeria/file/sezapejarade.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901233819.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/semofag.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b7fca19b7ed6160a289239f0a323cde4/ruvokoziberuwazawefuvaze.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jedupavakipamiturekawe.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/49983138868.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/94512737458.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2da427ba1b4c469380ec01ebbfc30853/zojegelufukinazuwow.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/41538718860.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/036eaf999dc8606b9ca740d45e06fe1b/64916126956.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/bekemitabebogaje.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/95564429.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdce595d8b---87539481944.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/bumiburejidonavubelazo.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/99024890465.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/17177892463.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/47361738974.pdfIn PDF document text
    • 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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 10812 bytes
SHA-256: e9c729de90c1d3540f81116dfe9b3fcaa5bd2f210edca8433ad7de9d35a7f88c
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 17980 bytes
SHA-256: 833a2caba2bafb2c39727cbdad6f4e788a7591bf0b0a4ff335aecadba21dbc27

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