Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8f7048fe669154…

MALICIOUS

PDF

84.1 KB Created: 2021-08-25 13:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bf98c17616644bacf0d23373c6f83d6 SHA-1: a320c38e53e3ee05cdbd79f20b7ec525ee1cee30 SHA-256: dc8f7048fe6691543830112d3f74d1be471d8abea2b40945d890b5dd3764385f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, with multiple distinct hosts and URLs. The document body was unreadable, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/fe45247bce6b0caed4a44fae4264d4a2/benetaxix.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608297afd1090---86271327534.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/penanop.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0a229j7jb5jcd8a6r9phjj3av2/72433973451.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3657441447d7fcbd67f506455f09ee58/sisuxodu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/28475018189.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nikoparuwilivurizagadej.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dobajujutavulapig.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef941a47f---pakavebofaterinum.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a5975465396c40bcbe479af83bfe35f/35088319095.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/45332336512.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/35293445793.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee633ce9af---52303964955.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/pexesizapemikeruva.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/24079693935.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/66789622438.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d4f89295---41345053852.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/ziravoxametekajidalu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7a0061fdd3b65b9b30b8c43011c1a4bb/58663612757.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/vonetilila.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/679817c06e5ba461b24dd9184de1d905/27749101563.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/tuvupek.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d15b19aa---zudexebejabutas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bsc+agriculture+business+managementPDF 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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16812 bytes
SHA-256: e03116dd29f125999d8e9a54be24c11d99da71d4bf4f3df8f71acaa020dde6c0
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 10748 bytes
SHA-256: af6de3ca7e0d52fbc894e63663581f10ecb2aca5aefbea72310861a99c1fd29f

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