Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5f41062a43667c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 09:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 220a73b6ff87377a2f0c34312300eae5 SHA-1: 83c1a1fe4f603a686dc5f383eeaf52264e1cd0b4 SHA-256: 8f5f41062a43667cd83bc930879a6e7037e769dfad66231325a2edc631afe6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/37gmflo3b04ptc6i75sdtf521v/najunovepu.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/361652958.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/rexit.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/51291465513.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/85745743923.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/18143954297.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607963dfe34b2---rurakesijisanuxub.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3205a68f04---1298272165.pdfIn PDF document text
    • http://tayles.com/uploaded/pesujejaxizosos.pdfIn PDF document text
    • http://web68s.com/upload/files/dojuniba.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/dobaweseni.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/51470972126.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/31768650315.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/25280b175d807d5c259fbdd6c44b5dbd/90037148510.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/jibagodajujoruni.pdfIn PDF document text
    • https://drsaman.com/files/mofojosuruposujamomisu.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/fomiduvupamikobafuwasivo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ltn8si3dml0m700tsopsajmlq6/mosipotufibejerugon.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4e5d5ef9bfc0181b6cb14a37340d996f/61267043945.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47387c476---juxelasew.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/resalapuzetudajigikinenu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jiiqnrki2f53nodjo13jnduqnc/51635642896.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bf274b528a2c88719b4e167b55913db7/95462802985.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5cd0b4d2---vatosetibifo.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/podefozilitezu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c529385ab0b---xovasaxuwor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tiwal+3.2+manualPDF 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_off0000b5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 14628 bytes
SHA-256: 51e42234a0ecc9f507b3f6befa4a5cc8406439b20bdbc61a55cf6f0462177e96
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 10156 bytes
SHA-256: 6249ebc423ed64e6191d6898fdd158d66460622dc69743cbcb2ce195c9f52b95
font_02_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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