Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66978659131a736…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 16:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4563d80c8313a6cdef223df330f8ab91 SHA-1: fdcc9ed8d54cef276aea97af55c99b848cc3907e SHA-256: b66978659131a736414d7f22206a130646bd07498709158f52c7aac33a522829
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the 'link farm' heuristic strongly indicate an attempt to distribute malware or phish for credentials.

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://drafthe.ru/uplcv?utm_term=chal+mera+putt+2+movie+download+480p PDF link annotation
    • http://studiolorenzino.eu/userfiles/files/5853557359.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/vipobemik.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/molejugip.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/98135711732.pdfIn PDF document text
    • http://canoeing.by/pics/files/lebudijatudul.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/39335963173.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/58663069290.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/maruraz.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/63748366109.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/36398685187.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/vimodug.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/xoxedakaximugatozuma.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ei3rn3hcqk7t45mk8n5k0e0rqe/rejawemaverutebab.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/mawopemesemuwolenanexed.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/gewupetofalawawax.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tetulixig.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qj7svf63kvi634c0e9jfo0n6m7/dixupasudanejonadoxatavu.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/81783797232.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/35889617141.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bb57f3c9---8901194328.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/9046348102.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/vasebozunakumaxaluzapu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/gibapakakezipine.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/27759350976.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_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 19916 bytes
SHA-256: de61ed8627feca5b32b924a37138e5608050b57e33e04e7ec69a68f5cc12eb95
font_02_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 11300 bytes
SHA-256: d00789623893af01892d45a5c88f83958c3248715b77fbc1fe00242f5a7b1041

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