Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24b8f54ed0e54c1…

MALICIOUS

PDF

76.4 KB Created: 2021-08-20 14:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6840ef15769193a3d65cc1cc63f7198a SHA-1: fa22f4e97e8d131136b9a1362ed47f16f02ba395 SHA-256: f24b8f54ed0e54c1d659559a90995443f4bd44d673a41545e7b1b0eac2c9a918
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many pointing to potentially compromised WordPress uploads, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/fenubug.pdf In PDF document text
    • http://moreit.ch/productinfo/file/gewututirafidovubif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634c71d79c---33930430511.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01793a3031---ludopodekuvepuxedozefenit.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c4ffaddc21c942738ca3312a7001c14a/16122611898.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/71864647234.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/17387804785.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210719145936.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d32fc55c6---57791979190.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2fb651ff41634fca8dfff13d51e60394/puwawokozisigegijofiruz.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/wejolilakururile.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/bidalowatujomisopu.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/69498499941.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/26591694313.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/gutirejaduwadenirusup.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/89961801016.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/1248309670.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/btpeq2j8gafbkdokedubrgh945/62629748665.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ac1e32f02483b35b130e3e9c495c4fd0/62524815215.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce6eefebc---rumisezuvelubaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+black+2+patched+romPDF 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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 10872 bytes
SHA-256: 2c395678e2f22985a7fabefb81ece62e3aa405bdb826451a7c8b0b70e52c1488
font_01_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 16652 bytes
SHA-256: 82840c660082a9ea0445a50d733b316b5aac97f8e12cf342a9a3557d1d2b67a6

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