Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb95a03658d3fb46…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 08:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6be15dbc5f695c8b8a2f48b040845b1b SHA-1: 1321b2917eb6582b4fcb83e8e6b51d204b1b715b SHA-256: eb95a03658d3fb46d03fa85630908b313cc2859a33bc9a2f9b078cc85ba4b3eb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external files on potentially compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document's purpose is to act as a link farm. The ML classifier and ClamAV detection further support its malicious nature, likely as a lure or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://unicorn-furnitures.com/d/files/xekejexurofakuto.pdf In PDF document text
    • http://clickvay.com/upload/files/96228314301.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7ed5a10605b725794230dcb088822957/munibado.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/riwadibadejasaweforenori.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/46738952299.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/pezefene.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130528924f7c---satutax.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/77366502860.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/menubabigakijubifiv.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ece8ce4739a0cc2b74dcede71e244e13/tojozisenenibikumulavezi.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/73043068461.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf1461ef2---xivijojajinikikimag.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/8061426889.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e891bed768---19220294293.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9266b88ee---11432437837.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/38762272107.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/ludeworegetokamatumip.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/96039801637.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/vaveputetadanos.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/79006829696.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/kogatodiwamivitutebovevox.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613521a6e6989---80481946364.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/sonesisefejerukugurufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=call+of+cthulhu+7th+edition+core+rulebook+pdfPDF 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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 18744 bytes
SHA-256: 7d66ee543b17aab2e4b10c6b37ed35239991ad4c89763b548e190a55d156a0de
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 10964 bytes
SHA-256: 837a33e7023b20d9e92729e77bfaff4cff702d7792f3837f2c02f9396e5f1ca4

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