Malicious PDF — malware analysis report

Static analysis result for SHA-256 326e0277406595d4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 01:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b1d2f431b6dfec7087a51cbc2d5513d SHA-1: 62c2acb1355068cd8cd27582ab9ba73452d745eb SHA-256: 326e0277406595d4771f8270e27cc685ea034d1f6a2259372cd86e57e2e0649d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, some hosted on potentially compromised CMS uploads, indicating an attempt to lure users to malicious sites or distribute further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://planet-for-events.de/userfiles/file/dolunabosopapuvofutopavan.pdf In PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/24740768796.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/mifapavexusofazax.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/buvejimidasuf.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d006af2c---36157443885.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/gudanojon.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/82451461989.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310196a79f4---88363154450.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/vilaworelor.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/papusidogopusulemar.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/tiropixilufove.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/28694236044.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///ravopeluwonixa.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6dc9c5909b3c6302063af63891a1384f/vanujisubu.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/bejibaz.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/37994247835.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a90c5b6c---7545819577.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905043159.pdfIn PDF document text
    • http://nincity.de/inline/file/fogubuvisedidewinona.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/vegumam.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/66923945095.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/49396025706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=unlimited+car+driving+simulator+apkPDF 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_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 11124 bytes
SHA-256: 86c04884a2322a04009ff2bfda6eb4de9a86e3e2ff6a6106800f2e490f06a5ea
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 18444 bytes
SHA-256: 8bfa8957b20750fd7592dd862072bc56d880932f7c39361b4771ec249a91ce5a

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