Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbea74f1fd114a91…

MALICIOUS

PDF

72.2 KB Created: 2021-09-21 00:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a97c2c80addc1b11ef147e0eaed8aef1 SHA-1: bd80a9c1aff461724cdec53930de537ecafef366 SHA-256: bbea74f1fd114a9122fa8408e2b8a6fd7d6714a1f9d4dbeba853a49eea537ced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://luckdidea.com/ckfinder/images_store/files/88364078127.pdf In PDF document text
    • http://elsekmont.eu/userfiles/file/kasawunofoxorajabiver.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/9839013552.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/2054724603.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/topiponitokefa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66109dfda---94120356858.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/17791125232.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/89704089198.pdfIn PDF document text
    • https://petikdaun.com/contents/files/joduximuxelozarugi.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/87475236777.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/57345561442.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/50448215758.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/21188511639.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148fada7bcb2---rufekez.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/zaroxisipujazabasaxu.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/17721635245.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/82584621774.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rtbtargibvclfbarof8tofrj82/56856045675.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c999fc8c70---pegobufagunabajodetaleraz.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/lufusafuf.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xebadolojusol.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/vifaxekakewabukara.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/25279156628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adobe+audition+for+android+downloadPDF 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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 10488 bytes
SHA-256: 1685437adecc1ecd4f5cdc6272ecc9bf15fa935badada42e16c987741c055028
font_01_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 15908 bytes
SHA-256: fba1ec0d34fb23981ec5e98d32f884216369fefa2defd295238eaabd9ba85a69
font_02_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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