Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c46ed5e814fda15…

MALICIOUS

PDF

104.0 KB Created: 2021-06-11 06:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ec43097914fd5f061bdaff221b1100de SHA-1: 5ddbde6061249e75e804b38f0f46d24d3d1c9377 SHA-256: 2c46ed5e814fda15130320223f2afa3653a0d4f69febb114d8adcaae18e6a5b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware delivery mechanism. The document contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting it functions as a link farm to distribute malicious payloads. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further malicious content under the guise of a free dictionary download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9435

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 https://smidgel.ru/uplcv?utm_term=oxford+latin+dictionary+pdf+free+download PDF link annotation
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/90b40e1af21f7d2e8f9e1fa05872b6ba/38465030079.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/28b81ab35b1cbe18210ca894e570395f/zafamabopevetuta.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaac0454be---82047208145.pdfIn PDF document text
    • https://digireg.org/upload/zawupekote.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/83890d2968c84255c7361f6388306310/robaligu.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file/%5C/92979058512.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0283cb7f843e0b75dc54c950f2750b98/zejavafokezaf.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/55839690105.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/70739ad440595837785e47e17386342c/jiwizolewole.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4krb39lb13r5hdk4780ii1buj4/38841456603.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/cc678b0b336b1c6ff9b0d6af9a88d924/99282520514.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57318aa1df---39836058774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF6 5260 bytes
SHA-256: 6541c4de96a96e38d3a7e27d6ccd0147252b5e172113a445974012b8ea9750ff
font_01_sfnt_off00015ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFD 4980 bytes
SHA-256: 087781d85f40c5b78398a369866f915634df068232a862e9da0020a3b7eab6eb
font_02_sfnt_off00016d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D73 12244 bytes
SHA-256: 605ab9f893078626c7264561cb4325d9ef196f396761344187019f7f98c333c4

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