Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbf8a38808689d4…

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 00:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: be7924e7c436a74504aebae0b765936a SHA-1: e98f3923424917a0842b1da40aeedaee47847419 SHA-256: fbbf8a38808689d4c0782311208cd60ec2797f7b1ea82c92af6eb6d5f45dfaf1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and URI heuristics indicate a strong intent to facilitate user interaction with potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://brandnewgoods.net/userfiles/file/10348678558.pdf In PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/3339684411.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ke3qe5aq4a03m0o0tj90oqk556/93035843671.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870ca4a4a1b---zozukazetifubapisel.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gilasigarajumakitet.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/rolikisedazox.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099edc0d0d1c---65916119945.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/nazetavuvelenexurupapik.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076036a3ea63---90976340817.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/jerunivugegasis.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/wikekasidunuferegi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0db2d2245246132d7fbe417ba884ae09/dojetanin.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/87912532656.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/ramuzenakojugexo.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/16814024560.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/vexipupufukadabapemi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/ruwadutotilazugipivoda.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dadc3b781---kobigabezof.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da702ac3b4---xibedofo.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/76808177377.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4baa1705a---duxejosimebajiloxo.pdfPDF link annotation
    • http://jjinline.org/file_upload/file/99035524014.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/nezibabututuj.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addee0f5d2---80712012519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=succeed+in+ielts+reading+and+vocabulary+answersPDF 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_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 20192 bytes
SHA-256: e6682a59bf9f8f6ea61cecdeadc70356071620ecaa55735d2e798c3468537ee0
font_01_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3B 11128 bytes
SHA-256: 670cc2d6bdf93b1de1e24e6e3c082405b818bd003b6f0970cd3ee0de4953e0db

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