Malicious PDF — malware analysis report

Static analysis result for SHA-256 33beaa5d450d9635…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 14:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 017abc680e057e7a6bbf88c424b009aa SHA-1: dd7b0ba2cac776b16a4b4915d82f3fdd20267d81 SHA-256: 33beaa5d450d9635b480880690bc20eacaa857df42b6d4271e8cab4aaf55a1e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to obscure the ultimate destination and potentially host phishing content or malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lakehighlandsrw.org/clients/863582/File/gufozubaruxiruxelapifabox.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9370a69499---vatimoparakorul.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/91022622956.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/dibasosesis.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/muxunijaw.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/60221078603.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/rexitoxivesokijuloxasas.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/kexatofolaxujagozotin.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/29947853148.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/m4h9ve6lasv93qoil0p0mc2397/fufukibaz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0fbc9067a---19503010116.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3cb9bd3b67b98773a59c5b41b0105737/30070555841.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/1927158072.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/bajugojuxilunaf.pdfIn PDF document text
    • https://medtek.vn/storage/file/27452824277.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/78079935758.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/56309850363.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/vusudorozaro.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/31084855375.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/sapovujatixobut.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/3879467854.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wifera.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/71b828a8c078cddaa0bdf1bbee171672/vetolejilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=flotabilidad+y+estabilidad+ejercicios+resueltos+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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 18940 bytes
SHA-256: a940ad4fe6a4a55ee9f9669d74bb5723478cdac4ac1ae943dc4b63758142857c
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 10968 bytes
SHA-256: 12c248709f392edb3b07b937a741767fa715ed7ca2fe8c2352007715358112b1

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