Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ee3b47efd1b773…

MALICIOUS

PDF

97.6 KB Created: 2021-08-28 17:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fb853b0c9ed73af0024d8d521945668 SHA-1: 8f19291aa99a791161c203e6663b00f0ca269f3d SHA-256: 79ee3b47efd1b773237304a2c0ca68d3c91919ccd4459eaf56dd36e77fec6ff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 multiple distinct hosts, some of which are identified as compromised CMS uploads, suggesting an attempt to obscure the final destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://rutka.pl/media/upload/files/72e28e55016dc05e2c98ea153c68e839.pdf In PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/55780059722.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e1b4452e84d72f29a9a930b746375396/94091014079.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/47976636550.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/nobexawosulepodati.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/pasetiv.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/90044014145.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bcffaca609eb353c391e4141f2243659/liriw.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/cd880d4a8ad661d2dbfe11e973b24977/25406067004.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/wunatasuvoxudap.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///najonanaminilonozuwuw.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/buwonet.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/gapumoxekomotefew.pdfIn PDF document text
    • http://dhf-china.com/d/files/28085918318.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/41767492872.pdfIn PDF document text
    • https://alariel.be/userfiles/file/talofis.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/92316192442.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/48591756326.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m66vm63d2qj9bgo6j8tpbj25ah/17715049557.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/24064882582.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ba0b7fdf6---48033578902.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/95d56a16212ce3ceec21e95a1e669b98/12349792609.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/xuvakovajikebipesafe.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee58cf795cc---54736934575.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d80b8fd3ed2aa62f04bd7b597bb466e/10744498455.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/gerukanepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+obadiah+in+the+biblePDF 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_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 19612 bytes
SHA-256: 3b6059455ac089f2d2af133f733c44f634aadc1696610b0a6830c87912bb8ac5
font_01_sfnt_off0001490b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16122 10496 bytes
SHA-256: 4d3a8c95fa94748cda59df532df8a822dfad88b82a699297538080c98fc18b4e

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