Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3844c7e8f1c7307…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 14:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 733fa6d34708291316de39ded1f112f4 SHA-1: ef888d9d2ee6957c6862130604454370c9ca1138 SHA-256: c3844c7e8f1c73077b5c0e3b17b35f1b999c25636846f2b3ed94cb82c7cb4aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a ML classifier flagging it as malicious and ClamAV detecting it as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://vadihosting.com/calisma2/files/uploads/jowegogak.pdf In PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/31563627892.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/41900051472.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/fozex.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f6e38e9fead432e9f07926d0879a61be/warazijiraporinamuf.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/43627320104.pdfIn PDF document text
    • http://www.toptehnik.si/images/pewos.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46935122894.pdfIn PDF document text
    • http://perksys.com/userfiles/file/nulafovepolisonabane.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/50178026575.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/jonoxas.pdfIn PDF document text
    • https://ntc-container.com/upload/files/86290086738.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/92836093552.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/pikubosaluxovukenojen.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kugidutimodofefomufo.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xumukigituj.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/xajuwomonotibivo.pdfIn PDF document text
    • http://na3.it/misc/file/dotagavufejusozowibigaxor.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/fasenotipepanav.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/nomuxemonejovobesolawo.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/jivurafelonipegon.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zasav.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141c93280dc3---nilov.pdfIn PDF document text
    • https://phunhai.net/upload/files/sanezuxi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1dddbf42d---18403602728.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/9511795340.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fd1bf71c2168931d03d6df9145821402/92474728104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gta+vice+city+para+android+baixarPDF 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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10752 bytes
SHA-256: f715e31a6aad766ab30e9fc3a10368cfacd1e2afb69f942c7173f62b234af2f5
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 19132 bytes
SHA-256: 8dbfe05f35d0bb85ced2eee902758d66717e66a4780cd9793b5381cb48c0085c

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