Malicious PDF — malware analysis report

Static analysis result for SHA-256 273d440cf0e0de5a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 13:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 787d096ddcdc28ac042e90486d735085 SHA-1: 647a1a72a4dc31d3e98321cdebe57fc11c9ddb8e SHA-256: 273d440cf0e0de5a6b270e67ffbcbdb88d795dfc8f25046e03e98025c7d2e6b8
156 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 uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://tiemhoahaibara.com/data/dulieu/files/zigaxomezelat.pdf In PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/70815487838.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2717e3835---9423310240.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kuwogid.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/10425944460.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/4556803293.pdfIn PDF document text
    • http://chpcentre.com/files/file/waguwesexu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bea70f649---daxera.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/80157044027.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ba93f3fe---sipoxaledoxirufu.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/forujot.pdfIn PDF document text
    • http://x-mobio.com/upload/files/13540737689.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/46638209144.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210918_CE0F6B666FC00C92.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/19374516223.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/25557822755.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/jifedefoxafozisovevesu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22474a04f---mazuz.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/28747582276.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210906_9D86E44A556D8099.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/gabatadik.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/44584793366.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109081530446447.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/dunapex.pdfIn PDF document text
    • https://tch.lu/files/files/xebenojij.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/46545385971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=alexa+for+android+tvPDF 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_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 10328 bytes
SHA-256: 340ced0811676194957eb08aa0c14993a361810744fb1fe413f6a35c27c0f3a0
font_01_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 17692 bytes
SHA-256: 245b61c55a713dd79a3707d7be0872e7d8a74db1118a0d671f5e2c081ae35f5b
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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