Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9d7b9c97f85d5c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 09:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: beb81376a8702befda2cfbac8fa8467d SHA-1: 739f91459bef3c0c8a5bd50e81d50aa37a6b73cc SHA-256: fe9d7b9c97f85d5c5c1164152f37336f689ebbf3588853f184f994b5a1041915
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://homeopathyhongkong.cn/files/79538684467.pdf In PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/83555537944.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/mepetajemegozuvopetexi.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/namewe.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/sixigazelokuvanotowokazew.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/36015218811.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/75245216746.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/73758657476.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/nirijafuxibajalesal.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/zufisotevesafiwan.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139550c91e9e---kazewerinegov.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/datosafimepoketexugifoge.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/disasatigadigapakabugoxaj.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/lidifibavigaxebavatejote.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b1fee72d87f983f75f04af3f647da514/walisiwumupununifo.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/vedexovexitijozibutipidaf.pdfIn PDF document text
    • https://unosms.us/userfiles/file/69982925718.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/zipatisixowifaxenuze.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/21299548282.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/popowopunenum.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210912_3F4BBB048C776F3C.pdfIn PDF document text
    • https://kiptep.ru/file/74957384356.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ce4ce173---vafimapiligetito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=poco+x3+versus+redmi+note+10+proPDF 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_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 11084 bytes
SHA-256: 30a98907c25888f726a5ce6823a2f1dc33657c3adcd6d3ba5e4642467be8420d
font_02_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 19348 bytes
SHA-256: f73df3ee658d5fdb94cd389e39f7ec9f747adaae1c0f508c0a683b1698b26896

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