Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b1a81c0350a879…

MALICIOUS

PDF

138.1 KB Created: 2021-09-07 15:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eff4e50dfc26cb312cadb22ab1593dc1 SHA-1: 442e4dde67338a34b77ff580201a148ee256e96e SHA-256: 51b1a81c0350a8799f6833d67061675648dd714fdbbd4f2d399da313abe80e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. The primary goal appears to be to distribute further malicious content or conduct phishing operations through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161237a89ee517---wufepujavutuxuzasebujenup.pdf In PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a851267de9---36937044614.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/pefatawefege.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/68804402388.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc2cb0811---37551364296.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7753f963---fizaguwis.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/papilubojidumarapisogir.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d02787f2b---80641396667.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/96450217079.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b31d004587f2e01e4465c4b41615fb65/69132540822.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/11547546378.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/tevepuvowiwit.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4dc0d50dbc1292a8a41f51147c2d86b6/lufemuwilabajatufex.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/5083152950.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/67302697956.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec863db1c---43170723434.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abc00760384---rajepu.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-12/20210812052949180807.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/70144544028.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/sedosimedixob.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/32968932785.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/13921314914.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b056147f7a2---52983765285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=infrared+spectroscopy+absorption+table+pdfPDF 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_off0001baa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2B4 17952 bytes
SHA-256: e258129eec5c7af91c0d43788f48c5f9fe72ad87a8c23d20b6b4d673681bb541
font_02_sfnt_off00020171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20171 10820 bytes
SHA-256: bf6c7e5f754af52095f4ad25e46319dbbeb87a037ba8b48e877e090ca4cbc268

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