Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb901dd79b69adf9…

MALICIOUS

PDF

95.5 KB Created: 2021-09-04 00:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0200665cd7cbed7eccbca81631b99a38 SHA-1: 8464ec84af152008a5b64bb474f824ee4a3e118c SHA-256: fb901dd79b69adf94a4b7f14e6579534382187adaafb1df4cac0bd91eb5b851f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://barrierball.cl/ckfinder/userfiles/files/61045052643.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/de8ae4c7e33cf1ec09e103c303636dd3/lidusopena.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/pizidubadujopidiberot.pdfIn PDF document text
    • http://home-plast.ru/foto/files/76255788012.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/794b1a972983cdc5f30063b1175747dd/nojolujofivekidonilawerop.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/mofuzolisadupupamizif.pdfIn PDF document text
    • http://belst.by/upload/file/93502823128.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210708050508.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6sk2eev41ilvlhi95r69eadhb5/fovunipinagigugosumixa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a383d74e7a3---70244869779.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/11609947959.pdfIn PDF document text
    • http://k1a.ru/images/files/file/tapibekujopekim.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/d21u7q583a66agjveumrk0hug3/bepinezitavof.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2468ffa6d488877b50d729ce98865f2c/benikobivajuranopufi.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/mefemikisupusurovu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/wizepodezimoduguw.pdfIn PDF document text
    • http://zatacorp.com/upload/files/luxos.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607364fc4a63f---vojogaxuzagowifetij.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/dapokasujoxek.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/rilarakogi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hnuc071rutq0gp19a624o0hm3m/xaxusimuz.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2698d1cb1376df61af1fb491f1d97868/bowebonitosez.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/4459354537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lista+de+medicamentos+esenciales+oms+2018+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_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 20784 bytes
SHA-256: b27c53ac0119f408d2b31b0aa0258a9c3c8d47f5b4afc28f85434a49ea4838dd
font_01_sfnt_off00013dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCA 11140 bytes
SHA-256: 5ae7ce1fbe0ef6b18a4a98701baf39aaba06cae6f1b7c4e69b8b24d09163ae1d
font_02_sfnt_off000157d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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