Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7e069956dbf77e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 04:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92a91e1c6bd7f685c7b1a3a00c7a8974 SHA-1: c86e5b2d6e24c20c28f91bd22d6627db1d97a72d SHA-256: 2b7e069956dbf77ee6b330405f33cf3e189a2242df86f023b0a76ffa295bd3e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external resources, likely for phishing or further malware delivery, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6693

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://chromoink.com/updates/file/rubojibuzomodemi.pdf In PDF document text
    • https://dehayemek.net/upload/ckfinder/files/vipofopojobofopikila.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/95664440798.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/26693072588.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fba6c532528dfcc22c5181a121191021/berepoperu.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/nexifakavipuk.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/91935403883.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608298e861bd2---lanux.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a5778483cc58782fa991a3ce1ea37d19/36575675495.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zavuwonugujuturuz.pdfIn PDF document text
    • http://mebco.ru/images/file/73904648896.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rigepimamimirites.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b090616550---47694184499.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/79236727873.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e2eac9b9ddbffc345ae3d7177875dab7/26691076746.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d30c25865bce1cb7c7fe579d9bc228c1/pamemupowafarase.pdfIn PDF document text
    • http://amdind.com/userfiles/file/91360884558.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/66776274154.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/28149968966.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/lenuxe.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/80137999793.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1450260db6652117d04472f5c527ed83/dumisirofuz.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/keiump7j3kdej0mkt11vqheae5/woraxebijukukexenupiveva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rotate+pdf+wordPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 10212 bytes
SHA-256: cc047bdfd5787fe20cc1941c450502ae33694b22fbb178883ed655e2288a8834

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