Malicious PDF — malware analysis report

Static analysis result for SHA-256 904039cc410b88e9…

MALICIOUS

PDF

91.0 KB Created: 2021-07-17 18:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5efaa013d3a0652e05ad37dd41bd4ff6 SHA-1: f2267f21f1c4c3bc6bb622e701828fd0a3976758 SHA-256: 904039cc410b88e9aeb9dc96bc87fcb0c839f8202f6399795ca2838f78a63b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These sites, in turn, host more PDF files, suggesting a chain of redirection designed to obscure the ultimate malicious destination. The presence of multiple compromised CMS upload links indicates a pattern of leveraging vulnerable web servers for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/675995092641ff211dc275cfc9e3abd0/1331929271.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0e3f92aa4fe5e22b1b88b999db7bf68c/42336003751.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/71236680467.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349e3e4bbe---76228813325.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210522071430.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/bezowenuteba.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf90377015---gidinosoledugetizipetus.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14560450947.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/xefazagexugodofuti.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e059752e1b---62957004928.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab386889fd---44896725901.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5588c2187340a44e4b895de8564d9aa3/12673747796.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8dc31052b---butedojiwugok.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/6109318826.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210607011959.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b3286234---tiverokodij.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f12377fa9---gibararuzivutena.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210531021813_440820902.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76607427946.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/76127371082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=words+that+have+the+schwa+soundPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 10576 bytes
SHA-256: 80ca9a38105a32650f0bcd91a4654abfc07a5944f02b845ce04a8125765d5a65
font_02_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 23364 bytes
SHA-256: fe79942eadd9d28348e6993895a1c0d4e4db2b41885d268386fd64fb1afb766e
font_03_sfnt_off00014820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14820 16632 bytes
SHA-256: 02e5d6a4a6420da3cb08f0908292ebda790a71cc0df603ff2d5e1bc9db4db6f6

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