Malicious PDF — malware analysis report

Static analysis result for SHA-256 52721561ab5075ec…

MALICIOUS

PDF

64.0 KB Created: 2021-06-20 12:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 613358c8e5941872b731241b23872585 SHA-1: 9a3e8210aa98acfd9912b42bedcb3b5a6574cf3d SHA-256: 52721561ab5075eccf2c28815d3a8331a06aa5d57ae9eac8f47f8397e02e0433
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to appear as legitimate downloads but lead to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • 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
  • 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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f57334b1---kotowezudaxinu.pdf In PDF document text
    • http://mxagproducts.com/upload/browse/file/38574286342.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/14mf55l2r93g88dhk23nmkpnq1/16193420954.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ceb86e7f8---gopowib.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/be9e95c0794d83e9d0f4b662ed4173ed/95541649553.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/dodidukixolofesukosiv.pdfIn PDF document text
    • http://i-dron.cz/data/file/4476574652.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kfhhe8416rc43o0k1c24j0q041/83027300329.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3ad27b14---25384093473.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b550cb3b---gumazaxoxotulowotomigogi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16202702521957.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/rujuw.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3ccb3a23d2092bb1f1c5660dc269e907/xizavufalalelulodibikosa.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799ead0d129---32341235511.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3fc99e03---xivutebavanoziridesekoze.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f7341e15---39155615100.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcb316a88---migugijid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lakshmi+ashtothram+in+telugu+pdf+free+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 5432 bytes
SHA-256: 5235dd0ed5a3abb8fe73ebc1067825c9c97193f033d301096105824c6cc415be

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