Malicious PDF — malware analysis report

Static analysis result for SHA-256 664c3c0b3605be58…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 12:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79309b71d9e54e4f8997d37fdbd972ee SHA-1: 76c2fbae4ee8c7338b9c3445dda01cfed5190282 SHA-256: 664c3c0b3605be5800a7746344deddc718b80467a5032068a057bf22ef464708
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thepokewave.com/uploads/files/podozevegilolajagula.pdf In PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/66993237925.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/548368367614016be29d4f.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/jekixawulekip.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/jefoxosumevonid.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/31939336105.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06c86d43a---mijijukenexasewepukevite.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb15141ba---28414827557.pdfIn PDF document text
    • http://fruitvita.com/files/files/lugivutowi.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/75723412084.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/8021808166.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/53957061141.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/dijiluxitadodami.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/12516606186.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50025ddb3504a99097ccd16acf7d9a03/70337193753.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/15505752666.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/xutaxo.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/penewap.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/wesowutimoj.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/68684791227.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210905093548746102my47j3navv6n.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/54502190805.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/xedimi.pdfIn PDF document text
    • http://guowangcable.com/d/files/86545331594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cartoon+app+apk+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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 10200 bytes
SHA-256: c8402a9a58528095470d2b8e5d8baac4ae6aa40d6e32202f6e765db657fafe60
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 18940 bytes
SHA-256: 13d4236ad9f9be1919af9a31daf56ee4540c6f5a879b12a9b8de4f6c3b05e501