Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8de1c05f310985…

MALICIOUS

PDF

93.3 KB Created: 2021-07-23 21:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 847479dbba6618ca1e6b9bc33b91ee9f SHA-1: 1be4aa5bbfadb639b931014f434921954bcf1085 SHA-256: 3e8de1c05f3109858194e2f1460125edc66a77944e409ac219eacc4fa3aed0a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML classifier output strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/076a874889f5c55b331c9887905acf7f/leruwolotuxafuwewu.pdf In PDF document text
    • https://bayihoki99.com/contents//files/belawefenomaposugubunifib.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/2977890040.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/6opuuu0ntsvrtqdeiaahhe4d96/54146414302.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d45f1e2f---widexamiteroje.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210531_B7FBD3E864237AFA.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de37ddc3346---53945406001.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/52553431518.pdfIn PDF document text
    • http://vodnik48.ru/content/file/juxojanuvupibejo.pdfIn PDF document text
    • http://mousike.it/img_ins/files/67963157273.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/bob602n7am9fode8niq4su2ih3/81268489248.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jijelerelew.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/fewiwejaxozetupepesit.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/141253921.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1ahrheeug94mfjnd1i7454kbn5/mefobajeposelibipoxerolo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5ee5b528---39757662540.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/8t4loqiirbam3gpul84pfodl50/timexeloralorejuxanavuk.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b7776ca2---99550580865.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/46028409790.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1eaa7e0e---94517497460.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80c56ee97---11749029158.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/bubenap.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fd7a0eff---83177315533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=problemas+matem%C3%A1ticas+6+primaria+pdf+con+solucionesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 18844 bytes
SHA-256: 359a1bb6386188885383e4e20053b7d5ebc70ff278bbf35fa109563e955a4fa4
font_03_sfnt_off000149fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FB 11368 bytes
SHA-256: a8ae48205b9a7c9978b884fcedd9c3fed1145af28b59ffe3cecc5663350e4bf6

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