Malicious PDF — malware analysis report

Static analysis result for SHA-256 3896ed33b8de9d6b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 13:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55cf2cbaffb30f9667110e675b5b4049 SHA-1: 9b4d174b443d45f984d5fd4953d7646e5f7feca2 SHA-256: 3896ed33b8de9d6b8d5db411f890c984b24a7c904c797f07e19f507e8b99eddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of a 'utm_term' parameter suggests a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=android+root+zip+file+download PDF link annotation
    • https://ichibaninfotech.com/ckfinder/userfiles/files/zagekifup.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/tipijonadoxoli.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/xafebasusax.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vawamofotojevavavobatifep.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/refama.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/33484560799.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/18700071881.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/japukanazisotuwo.pdfIn PDF document text
    • http://chayka-svg.ru/files/15714026192.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132836c19278---sogakogoxozetex.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/10965900886.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/41607653251.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/930eb63dd5e62123b98c5a942dd69a1b/18696154892.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/87862846816.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///zapef.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pimosejetodoza.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/xowasotu.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/75995568454.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/pesulaferomodudabiser.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/759606876.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e1fb8492bbfaef5cd46a557d9b2d56e6/xoletip.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/51816802706.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/62814295942.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/xunijore.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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 10452 bytes
SHA-256: da444d837a446ff1c114619f7066ca6ddffa0a701e53e61ef102ffdaf48e75fe
font_01_sfnt_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 14652 bytes
SHA-256: 56dde811dc6ad84deeac125be11a39fe748f120eaaefbd9a087e46d0390c21c3

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