Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d66b33c424a8b71…

MALICIOUS

PDF

88.6 KB Created: 2021-08-23 12:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a14ff6c3e6ba355d3e3b31182158b25e SHA-1: 658b6594debc52e1d97bbcb971fe27bbb0723ed6 SHA-256: 3d66b33c424a8b71b2bb25b9f3d24becffc71a766527d14e37d1c2d4f63d7b4e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to lure users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://art-eria.pl/mandarynka/pliki/files/pixiwis.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a3c5a5aa3faafb67727649245ed412a6/wodurapoxefa.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/vunosox.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7031d1a57---zejasinano.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/93355570487.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a21788e2ea5---nileviwi.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/47902952141.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f11c41a5f44---7337324259.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0b15f508---bikesilezakoxupux.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/74174585382.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a05e055b8---pusimo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee0e7f5db---dovazeger.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/72446562588.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eili2rrtt9aboau215rhp4cdo1/24097220845.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/59112385324.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b5bf4227f82b145232f0588294f7ddb4/53420412916.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/sovixibokutamuk.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zudapa.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/haj6gsaftrvaun06g3e4jjbhh1/11912533580.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/70265090589.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/zibobibugodaxolivolofa.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/44819105961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sublimation+polo+shirt+template+psdPDF 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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 10972 bytes
SHA-256: c656c44a9c0cd07df81f11e481f10959d4bc3691646055b16000f9012d0e1e62
font_02_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 16172 bytes
SHA-256: 4393f83ab3685ad7fbc23eee7fe36d35e93a14be0ca725bff75da9558d0824cf
font_03_sfnt_off00013ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDB 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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