Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8890281a522d0b…

MALICIOUS

PDF

98.3 KB Created: 2021-08-02 17:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 156ba2725a4f736c7f261778c23347ab SHA-1: 1bb58da01983834a4eb32fb48740359ca23c3969 SHA-256: 8d8890281a522d0b893cfef8251b22dec693a0fee20454db665a830261d6b3ee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maximatrimony.com/ckfinder/userfiles/files/nopijefejekumajaxenude.pdf In PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/36272757917.pdfIn PDF document text
    • http://espicycooking.com/files/file///94719038344.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0fde88777a6ffdc201d338963e1fb576/1461245373.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210609035754_tncf1f.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b861b72df---93407598656.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/fenemazetawutuxo.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/xajufix.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26dc9a5562---31140076524.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fubifijufepigutukidilode.pdfIn PDF document text
    • http://wohingltd.com/userfiles/11421792256.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1f04159995d7280fb3df23b52ad2ea07/87218960544.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/83e4f9ede0bd034bbcaa5712b0c385c9/78251024120.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71e6abaeb---tolozomiwives.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608762f169383---dukatopinusogelipiwepepa.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/40118470225.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c30bc39fc---gatapadupape.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626124276.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/talajapuxuneziziki.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160db08e4bc9d3---70520247299.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/phgmga1n9159klh1i98qkpku3k/viseduboxalepomufuzab.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/04a30d1677f1c06e4dd4a5ab112d507c/24716106729.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e718f4777d090ed263a9f280e9c7d68/tadazenezinunifuk.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/48259714910.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a71a9cfa72ba0c51172028e0a0064cc3/32397137321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+tell+if+a+chest+x+ray+is+pa+or+apPDF 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_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 17628 bytes
SHA-256: 81706ac971d55c17077750758718025e5d73413c6c95743340874294f563bdee
font_01_sfnt_off000149cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CF 10768 bytes
SHA-256: 57d0ec7adb6571299df0f5959e07db6e8b5b35427c56026e90cfa0882a4f5f61
font_02_sfnt_off000162d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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