Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1fd2ee7fd0d1ed…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 04:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 814de5021b4f084643af02cffff17fc2 SHA-1: b346332eff00340f98c7d44e818136506482fbf1 SHA-256: 4e1fd2ee7fd0d1ed03a946528dbeb331fcd5279e570b339ee6d61551d0a64b52
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs point towards an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lalicorne-hotel.com/userfiles/file/jivuzifimatuwemufari.pdf In PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/gunivelapoxi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/imjl4qp8q0g5ogoeuc7ae1ngl2/23786368460.pdfIn PDF document text
    • http://torgoborud.org/images/file/57109482951.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/lojokip.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/supoxumijemakosemekeli.pdfIn PDF document text
    • http://ping-property.com/user_img/files/78916800626.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/zamadubofodabazofirix.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69f40cadc---7007469762.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90719889448.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907230437.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/40124607858.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/67546757710.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/39587822136.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zamuzatolet.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab24bcfe2a---74308011714.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jutugadiwaveneg.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/telidesaki.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/zewekelutero.pdfIn PDF document text
    • https://windscrm.net/files/file/21824016918.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b1a0ce66---11575591166.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/62882420491.pdfIn PDF document text
    • https://negaratoto.com/contents/files/puwavekop.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dexopi.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mosafovumugotobizomesiru.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/86064632960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=install+rom+fastbootPDF 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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 19068 bytes
SHA-256: 867cb30c93b692b072218b025f4c0e5aaa96db05803061f045a36d131056011f
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 10240 bytes
SHA-256: 5d8c69cf81a66a0d362f85f4e0bd09949de2ceb428da0f22ce1ee4a41a33de00

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