Malicious PDF — malware analysis report

Static analysis result for SHA-256 8471d6f6f9417e45…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 18:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1acd571df2e285443d492d531b649909 SHA-1: 2ee5f7e5ebcbba107ad63fb0b642d5e3e236e99d SHA-256: 8471d6f6f9417e455bc777369ac476b0a49a55d85e7a78142c15acd0077c7fb8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was generated programmatically rather than being a user-facing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://tiramisu-o.com/yamituki-n/uploads/files/sijotedopusipaweboj.pdf In PDF document text
    • https://jagamimpi.org/contents//files/38798374887.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kedenetupumiweraw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2e663bb8---37589275313.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6aef93afd---79698268380.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rofod.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/entspuu8eus7csb1862j5lehtv/wiwogusekosaxuz.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/rugimopuloxanetopomozimip.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/tupepifure.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sozovuzibanolofupun.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/wasudejet.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/kolagefebeko.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/59401409745.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/sefamarigimagaw.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/44792103003.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c92c856f38a---jinikekixogimituvokegeka.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/zujebovabezekekuvazan.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/todurijirigujinuwuku.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/8899644774.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/16312463213.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b43f8a157dc386d7d24dbafef37936b0/21211308789.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/df415fd8e8593bdfdc89d9719cd26d5c/nukubasonu.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/43217005817.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/zatonutapipowilalovonofo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072800e3c216---91266641393.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/r1t0utff5qmhu0v33ej65stm44/gewojisezatesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=english+activities+for+grade+1+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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 17640 bytes
SHA-256: f42cb5d9129e03d3e1fe6c40a7783b82e55ba9e5ee1f9e5be7a8376ce25af9cd
font_01_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 11000 bytes
SHA-256: 56668386a789dcbf6f9caf20ae1fbafc1c62c2a5599025e25e9537d8a97fce01
font_02_sfnt_off00012eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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