Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d01a0ad490a846…

MALICIOUS

PDF

75.9 KB Created: 2021-08-01 13:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 63e35a041fb9aebf99d7f51946d45506 SHA-1: 87be4c1fa3fafb786431bbe76cb71d1f65e9f002 SHA-256: 81d01a0ad490a846b91dd4fef7547ef365fccb19921659f083b594bc6deb88ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://austarpharma.com/upload/files/56517990400.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/32187555d61ca4b4c2ae9c3ee11429a3/55373720733.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85c2162f6---64636996638.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6d0d6476---97708371597.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b255d473c40---devimozijefigip.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/rufipetikepufubomu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/82342473280.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a96449f7d---78827379312.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a04713f8f---63919595777.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca19c37068---78794526162.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fd975fed4---besegon.pdfIn PDF document text
    • http://placc.info/up_image/badoxibaxebunoxop.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0f3eefcb02732388b5654da55d8e75b7/zosowigedalubesekelowadu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4750b7e6028675877a573e2a9dffad7d/66541321916.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/rimejepalakazexi.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/betogezija.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f57821720033134ccf5da6df980de66d/25629288732.pdfIn PDF document text
    • http://bdn10.cz/files/file/62575779214.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tibikexuguramezad.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/53816352119.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc94cd93ec---82365939478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=detroit+diesel+series+60+engine+serial+number+locationPDF 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_off0000c21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21C 11244 bytes
SHA-256: fefa020ef7c5cc00e304f9797eea9b9016b0de5b199d92a793369b5b2a9b10c4
font_01_sfnt_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 17596 bytes
SHA-256: 5b726e8cfbc203f1dcbe802ee136c0ac2aa935875382843cc9442540c8623cb9

Open this report in the interactive analyzer, or submit your own file for analysis.