Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf6fe311bbe8b48…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 19:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed83003d96d85f18eb09a6589b92d938 SHA-1: 7571dd2c67912a1b2da0f8ab150ce31a4df0563c SHA-256: 8cf6fe311bbe8b48ac7357444ecc83aed42bab0a5ec1824d140b631f08857c06
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm and compromised CMS uploads points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://krisoc.ru/uplcv?utm_term=transition+words+worksheet+free PDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b92d1add---zulamosa.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef0215bb8---61395263651.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/85610503335.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/59393392298.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/winaj.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/bekufibopa.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paveveka.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/xopeben.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bolotenumit.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2d955f7bfb88fe03e0697868c4fdad43/54952421864.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/78306408160.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9c9d7780dfb4591b38be325be9d90c43/52711385467.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/af2021898e7a71589dd1d2703a597bd3/1906607350.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/64876012688.pdfIn PDF document text
    • http://erictex.com/ufiles/files/bupiniwofaja.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/xulasobodos.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/vokeliwuwopaxanasupig.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0faf2439b---47097947174.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/zukulov.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/pomozesikulike.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/94be526aafa0ae9524f96297fd25fea2/regupizadaje.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_off0000c217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 10548 bytes
SHA-256: 3c7d577b2ea207a2ba48b5721a4955ba39abee3c1c6c7d0db11bc5697f06410b
font_01_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 17196 bytes
SHA-256: bc3d6a2ba3bae0757824ccec7e9ad4dec495feacfab6ce1d7e053a0b0f94767d

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