Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cbbc16c741a308…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 11:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1b456becead601d42b4aa9f104f7941 SHA-1: a21385ce06ed75034ec354aea329ad227db8c063 SHA-256: a0cbbc16c741a308361de545785d0fc071f57982b37c47e0fcdc661fbbcf032b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/178fd5dd3115aea05bd444d1629b4a48/5163542107.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b52ef1e8---bepiwopejebarapilajuboz.pdfIn PDF document text
    • https://citytrafik.nu/images/file/dinevivivetu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607375ec92986---buwuvevarujimiwumo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/40008861940.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kowuvugova.pdfIn PDF document text
    • https://vestol.bg/files/file/gimibilabusewuxinuxulen.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080acee0f7a4---83683543640.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f631cbe9d2f6b180290a18adb696bde9/wujuz.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/62900970545.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ftnn9r3oaulanfst58i5c80tv/kisubulebobutuwul.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ffe14afb---goxub.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/921ebb7c01016c0a50428395b11b1a51/jobepeku.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848f95b9356---xexofusaxoto.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/57522662308.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a8b0a5daeee6c1a552b66c109da6fcbf/15125202239.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e04a6fca---20060090814.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ea77adec0a---fusufirupovujudobo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8e04f01f68634e08fcba4df614aeedf7/xoxomojelobikumugobosele.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1758cab4---73999014170.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483b1d5b94---51896755248.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50ddee738a79260312945e3ec27d1342/67145842995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=healing+zombie+villagersPDF 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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 16916 bytes
SHA-256: 195719e4efe6ba7015676f52f787f584b3803c82f1d2d9f12e721e1d96b54e30
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 10612 bytes
SHA-256: 1abb4c784c43479a3ec002b6b5defa4b888b614bcf630eb9b26867de62269365

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