Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26b83de2633b4b8…

MALICIOUS

PDF

83.3 KB Created: 2021-07-28 13:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15c88020cabfe11e179ef581df65e888 SHA-1: f7027547ca30d5b6a25c2058b0b00fbfd71f7557 SHA-256: b26b83de2633b4b8f8c0b12d7049b1579c5f560297653e9e5418d2ea2a535311
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. Heuristics and ClamAV detection confirm this is a phishing trojan, likely intended to lead users to further malicious downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/48v6ga9s0u78umc89b5gds0hr5/totilivo.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/67757244478.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083436b9f36f---14762978810.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b3dc3001---42541770191.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/daxafeva.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pisojesoverisuvawaj.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/mogejolenowijilejisowuj.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/88284318897.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afe718665---65463626734.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/89781113311.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/nijinelamepukuzujepo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df735d8c68---27909917709.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bd85ab13---70009687875.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b433c7e7b8a13771a66295942af0d027/xugivumoda.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/moxagizusujotezenavuro.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fcb20eefd73e93e53c9e58a0dac5085c/sebanarexejojulogobeb.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160726a7c6512f---zanukewira.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace28408197---lobobed.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/vubonixovepogekuzosil.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/kuwuroronajazib.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/wedobuzus.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3c747796---10221031858.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fa7dufafkf46gtft5gg29d1o20/79828026151.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/516ac21448ef382d8d8d8fc3932eeb2e/23493364500.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e165fd9cd1---28971481050.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfaa5b061a---nisesof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=visual+basic+2010+ultimate+download+offline+installerPDF 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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 19628 bytes
SHA-256: f2cd253562d0d3a5a1f3e28bb27d1dcae5c4ebf9b33a6e7efa2645c39112e138
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 11228 bytes
SHA-256: 8557952e2c4afd241bc87ac3be7a766c77628e390d185a3b7c58a2f57f0ad498