Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4b0753c3971f94…

MALICIOUS

PDF

84.5 KB Created: 2021-06-20 03:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d7b6b4f3cbd5e45a5b87d3c854ce22e SHA-1: 0e298f2a43d231355c4ae0fd99f9abbb5e374c67 SHA-256: 0f4b0753c3971f94da9669c6c62dd348f97f1dc2d7e050679dd020f6f51f00c1
64 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to files hosted on compromised WordPress sites or disposable domains. The heuristic firings indicate this PDF is a link farm designed to direct users to external content. While no scripts were extracted, the nature of the embedded links suggests a potential for distributing further malicious payloads or engaging in SEO-based phishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4410

Heuristics 4

  • 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://cructi.ru/uplcv?utm_term=practical+electronics+book+pdf PDF link annotation
    • http://usmleworkout.com/files/file/devupedoji.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d3ed4223---76120547355.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/mujobudonazulise.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/snjblcq8cti68b4oa9fjrqb9t0/vivudurikatota.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/bukasupafefugokaluzip.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/loldbc2akbh8a4fe2hp3r95q76/25264708274.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/dahq0ekkh53i3htvfo2ronv6e5/60615022203.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gfu0eomlvv62cltdn85v18cirr/kojixo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0b69b7fef52e145d41b212e2cef749e6/saxigiburoj.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4482a0faf04ad30d1427fffa4673760d/bufuwinegotuferudivigu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kozovuso.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/23123690328.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/kk7pd4stfcipo3b8odernp9ce3/sozafojavabovixawerew.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef1da3847---37936914301.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/43242342577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 5144 bytes
SHA-256: 30f2b918fd103e597bbee478ec4642493e57d61f68c3894e8e36bcac43503437
font_01_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 10776 bytes
SHA-256: 8b30629be402090417f8abdc8ff702fb244bebb66426c37521413b0b453a37ed
font_03_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
font_04_sfnt_off00014580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14580 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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