Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f1f605970d9485…

MALICIOUS

PDF

75.5 KB Created: 2021-08-27 18:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8e44f3356bcbdd9123329812a9eed5f SHA-1: 2f412eec3f3ea640ad350141b6ebf0468a335e76 SHA-256: 54f1f605970d9485c18a778ff7ac8d0abf5e1de6eb223bda804900947df70d86
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that redirect to various external websites. The presence of compromised CMS upload links and disposable hosting suggests an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=cole+porter+song+well+did+you PDF link annotation
    • https://dichocungtoi.com/userfiles/file/95697034243.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ddfe2f0fef6ec82feb90469ce63eaff/kufipoxinunemujepaviz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b38a3bb165f---vufub.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bac44ed97c0---98113700470.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/vokes.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087600b13247---zopamojazitipidoramipide.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/91818814653.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e56e16714---69765317132.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///25306222784.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/vigakotunipesumupomutotu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0c8f726fef056de7a7763cd6173f8ba0/45036453528.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc2337da70e244b1b5135ffb6180808d/sifoselusosuxojorikizejom.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rifesurewavogisozolexef.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2e60dea19---derodumokobamimufam.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3vd3q8u5jbl0lppvi7ra4vjive/rojiruxopibijila.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/97375139692.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/mevadewum.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f44dc86db8---sobikekenimugufuwa.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/talemokulutusufazalo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612101ceb523f---99150949056.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/zupetesizogifofevu.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/favisemaj.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/357c0f76348c67386621bb294591cb2b/kifezex.pdfIn PDF document text
    • http://drtamerturan.com/file/64365628999.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_off0000c382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC382 16736 bytes
SHA-256: 3ab85c25e041189d5b1c6a7f1b6b50e15493a16bb71db5b442487ffc9c102240
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10736 bytes
SHA-256: 74292af9fc53e807c9e79276e7a1bec0db77c1b787825d9908edb8f8c18773eb

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