Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b2f4e414b99d92…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 15:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b351f83d7634e2b9a0a92b4e03e87af1 SHA-1: f8da07cb4f9c645f431e1f838d8c8ebb66fe4a62 SHA-256: 17b2f4e414b99d92abefa9eea976ff4f68193ee686ca7b459fe8dd86ff1d5416
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://namhunglogistic.vn/site/files/62201500944.pdf In PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9bea861c---timubalakasidezav.pdfIn PDF document text
    • http://bushurov.ru/images/files/66606207309.pdfIn PDF document text
    • http://nikunjfoundation.org/ckfinder/userfiles/files/nonexakudivatarej.pdfIn PDF document text
    • https://resicolor.com/upload/files/zavaferipevoxubag.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/83082751964.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/19868857927.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d668d3b607---33709600326.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613063303b2de---74174506511.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/57579103344.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/14947346354.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e2d3855b1---refokomi.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/23804399180.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d9b59b9cd0805f6d150f58250c5e640b/47288167504.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mu7ejs1vgbra9res3h5mu3kri1/vuvedovodulune.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b97ef1116---12192607222.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/9216565010.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///buwemew.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/96357376822.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f782a5d9e---28389844728.pdfIn PDF document text
    • http://ubest.ru/images/file/diwutibopakisozexatewivov.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/raledapevit.pdfIn PDF document text
    • https://la-klamm.org/Files/files/lukapulovaziwovexaxatosa.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/nesoxupafivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=whatsapp+app+download+2021+new+version+free+download+for+androidPDF 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_off0000bd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD59 16828 bytes
SHA-256: f721d82f7c06a460189bcd3f3c247e2ac7f561ffc6b4dbf60806f2c891c6eab9
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 11032 bytes
SHA-256: 4012c65399d120ad11a80f91f2066752d477476daf23b782fd28d8e5d4782e85
font_02_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1