Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ac8fafad2ee042…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 06:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 826f4b01e03cd6138d8622dfc45958a9 SHA-1: a3dc56395da31fbff46c7ceccdea7582a6da8590 SHA-256: f8ac8fafad2ee0424cf756afb27ef1906b73f2e79dbbdd88c5bab903a535e3c7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads, such as the one found at http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b81daf47---36665143246.pdf. This pattern suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=endangered+species+worksheet PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af580d43bd---lasexope.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/wilimosegevadiwosal.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43d5ed4566cc7a9412330a7206491513/61663818206.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe143a8aeb1.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/72fa1cee3a18db77ef897128327fa8bf/kexumulavekado.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lik8kkbm5kens782p3c5af0la3/zorimuvewo.pdfIn PDF document text
    • https://digireg.dk/upload/32826485764.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c503cc7cea9---gagibe.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/powakolevinexoxu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvuksadd8871996kls1j0mdmd5/75401610197.pdfIn PDF document text
    • http://kmsenior.org/file/files/76147340170.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/uvmtq8aobnfuu3hk6ehu9tnft6/85858979270.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/31/72196794482.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557a81fa88---xixuvukujazinudivamu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/66804019675.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052204491259.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/nepibuxela.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16082a0dd81b6e---faloda.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071922030780---41891298194.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/solipatij.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j9gfpai8bubebp75jmjgu81bq0/98957173802.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b81daf47---36665143246.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_off0000b755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 17028 bytes
SHA-256: 25dd2e1c60985e8d84b115f06391525f539215eca1e92d91dc360ef8fa0f4b08
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10908 bytes
SHA-256: db0f26a1fb1b0fc38659f0036f4e5bbdca8bf72b1bb5fa052b4b503e1d3fbd06

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