Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfef3ea0beb0dd0c…

MALICIOUS

PDF

101.8 KB Created: 2021-06-26 14:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 41120c80b7a2b6adfaeae932db658637 SHA-1: cee16c0ce7e06a30010bcd66f4fa4cb7cc21462b SHA-256: bfef3ea0beb0dd0c8858c7f94c4496dc3495e540069faf6e5d406412b47d6442
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://446888.top/userfiles/file/32877154157.pdf In PDF document text
    • http://fine-cottage.ru/userfiles/file/89911142837.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/84b55b0e93a7149e9e1768affabfeab7/soroxosusejufekofiwab.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796277822c2---5939528486.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb48ba8e63---83750867574.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/19885910407.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vikexukipifafodo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pideji.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bcecd782---nepexipafifojububika.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/19466554828.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/9eee7a0e5096da68500db8f3f47678fb/28421987951.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/nevavataxurujitig.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c1c033d98d0ba236a2d0fce8d25b53c6/ruvasabimevomokofotep.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0080c335d2---sosepefuferebeda.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/nulukudebepi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e4405396---87284509162.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6d6627fec5e43f1bb2a0f164c1e9b131/21926554371.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/muwoxonofobafudatuduj.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6db953bee---sokamexanixowusifofekebat.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086d82e2dafe---bokufotutumoxamexu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/g619t5la9guo4d826624l02ljg/nunakegisabinotakutiraj.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/40106717477.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xakizot.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ad9557d5843ae3efaeaabaf040bb6dcf/wutugavawivegebojenus.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/92cc027360ac2a0a8a8cff0f01d824ed/tuxejat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=meaning+of+at+his+wits+endPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011ee6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11EE6 17664 bytes
SHA-256: 076f5945d5dea9ce7677e280703ec929994ae8e8d32fac1cc8d6b3b8f5ce032f
font_00_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 10564 bytes
SHA-256: 757bdb272734e8d28d0ad0b82f3f07123a3714a049a5a00082993990efaf0135
font_03_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 25116 bytes
SHA-256: 6ef3e3d8853590b703d24b1f9791b195e2744207b111ccf40218be897a5a4757
font_04_sfnt_off000176eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EB 4260 bytes
SHA-256: b4de3e8f3ade9883ad014d3711dd070b298e84f7efb797d3092d2d6b3a156b67

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