Malicious PDF — malware analysis report

Static analysis result for SHA-256 383ef862f30710c1…

MALICIOUS

PDF

75.9 KB Created: 2021-06-06 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b28d54396fcfece3a3ccca2c3e40a410 SHA-1: 19cb0ae65164acc09f2cb41068f636932cafec9d SHA-256: 383ef862f30710c1baff3f733cd82688177e6dcbe41a488e70c81414125cb64d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=rubik%2527s+cube+solution+3x3+formula+pdf PDF link annotation
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/3odlctkfbn7ts3koorv7mb6gn1/jomop.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/19fa3c5a0b3bf00be6dd58937df4ccaa/25962355896.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021050706120875.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/47d5dae7ba8eb4c503bd8643a1e84f0b/33785490785.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2df70e28---70944616007.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/tipufatubimix.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/45865403832.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e317b4806---19447556353.pdfIn PDF document text
    • http://fittbike.hu/files/file/66433444978.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/88718a85010008a60954d38275235fc7/27777257668.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160babb2b6263f---ruvarorononomonafe.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/pijekodavipowafifite.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/59140226979.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pu2h16grt1q6ur77q0hh76ds3q/13311638188.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wewenenuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 5780 bytes
SHA-256: dda7da2d128c27d384d7382d0b8523b2c828da4c5a16b7024fd70a7aa841f307
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10700 bytes
SHA-256: d936d98fb3d8fd9f671bcf2a28aa283af45aecdee1ef27ca324bfb075917d8c9

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