Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7a0826dce53d53…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 16:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3302b9e90a005339702a7da7091dc55 SHA-1: 1c8f08c494ab234f74c14fba52f26da6da62a85b SHA-256: 3c7a0826dce53d53629d5b74261288551ee84a51a9be84bdfadd39b053c33b61
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with a high risk score. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user interactions, likely for phishing or redirecting to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=answers+for+math+questions PDF link annotation
    • https://najlepsze-w-polsce.pl/uploads/13061780627.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/28043075376.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/talagelabajos.pdfIn PDF document text
    • https://cet.sk/res/file/xibogodivok.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/rodidixudebalewikupuki.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/10438811100.pdfIn PDF document text
    • https://isosklo.cz./uploads/36675137309.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/linifesakuve.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/68cfa21a4bf22b17ee4befe675debfc7/muwas.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/45371691894.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89f5306e9---36704382990.pdfIn PDF document text
    • http://lex.tj/img/file/jepalagefi.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/20283948898.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/vijirabewuvuteso.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4sf6dg42vat75abc1a9i2g3o8i/83640989006.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946181b2414---wagoxiziterimabulojeg.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16d49f0a6---40611589027.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/77359182675.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210608_111953.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/30544696431.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/327a16da4b0e4f9ebf8348dffaf27c3c/woxogekorobat.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a6349a51---38427593331.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/76457927699.pdfIn PDF document text
    • http://shimoltd.ru/images/file/39847453786.pdfIn PDF document text
    • 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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 10744 bytes
SHA-256: 86d72a3dc5bf35f3effd2e97d84fbc213670f28fb0c160390b9b4e0eee3a57e8
font_02_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 15968 bytes
SHA-256: 8b2c300893947b700bfd7dd042ecdea315fe2ca6649cf75431a5782a777df51b

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