Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c50b1d38ea39f7f…

MALICIOUS

PDF

76.2 KB Created: 2021-08-06 07:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 08a82ff7c461f7fc5fdb55bb99695fda SHA-1: 3e287b0f670fd17f42fce103f7bc461ceb50ccc4 SHA-256: 2c50b1d38ea39f7f4747933f72ea37d2c74f2653a1f0bc407a23643590b4e129
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161085ecb08970---31417249735.pdf In PDF document text
    • https://jxloanchien.com/style/postimage/file/31987939948.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/80953045453.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/vanepomirutedewuwutak.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f6e05e33---jeraxe.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cbef0157---64830686122.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/95596243558.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d49c5c10edc7e150727d993b28e45e4/42712682212.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/61135340923.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef424c779a---fivuxurezegu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/duvimafamatufiragoza.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/16970763943.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2rbia1hm2a4124upo6vbcqck95/tidet.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ars5v24l44mh3b5al8skgftb07/7180346714.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/94636784270.pdfIn PDF document text
    • http://canvangdientu.com/images/file/53019696884.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/67b61ae5409edcc7e750f64560cc0391/buloxubiwulaso.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zaboletepajuxak.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/60977600464.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/955bf4ef47e499813a6f8eba8302670d/91534044349.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/66393862930.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dumokavuzumixafupuvemi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a3767b7d8---38444550005.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/zubifepide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=math+u+see+geometry+answers+pdfPDF 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_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 17636 bytes
SHA-256: 31941b109a25ea683c1e7abb77b7a72e55cf6ac0c612432e3eeff8c6d918a47b

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