Malicious PDF — malware analysis report

Static analysis result for SHA-256 47318332f764ccf9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 00:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5cfa09d6acdb5dde8c9e7c7355a41d9 SHA-1: 40c97aaed0c9fce06da904adecc04fda8710043d SHA-256: 47318332f764ccf99ffb7211ce08f4ed7a47c7960bbf2269b4505abd9cdef75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hataylezzeti.com/resimler/files/nuxafupilaso.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160700fec60491---revepuxo.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/19370638492.pdfIn PDF document text
    • http://araonline.hu/uploads/file/wubotogofubovija.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/dapobofupedajitidalemi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b00c848c60cfa2e482f76a696aa6b83/97318939078.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/82430975127.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jopum.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/05818b985b6c2daa512b7bdef2ce9f1e/wizijupunubexuk.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/92118474727.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2a41e55ddcfbd13fc27d5dbbe6bf3e38/fajisijedevonol.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/39304114546.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/kewof.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbe83b048---xikibupolasesufewuw.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/61322387869.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/q7lsuuh85d0j2hj2r78k49ulid/kawataxinimeziduxomorebib.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/dizasesemate.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/jofatokulutopimodazed.pdfIn PDF document text
    • http://claphamtaxi.com/survey/userfiles/files/63329509002.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c064ec0f8eb---7771151947.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/60345909917.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//24114267581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=edit+pdf+adobe+creative+cloudPDF link annotation
    • https://easyown.ddproperty.com/datas/files/5912000127.pdfIn PDF document text
    • 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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 10628 bytes
SHA-256: 0d56624ab96897177ea21d87fad34dfe91d1f3b41a425ab9013f9454b085652e
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 18824 bytes
SHA-256: dfbf6c35ebfa2f4fe39091da5f38cd51ea45c8b0bafb0cba249c63dcfdefcf90

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