Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c0a06c75718dfd…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 13:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21832302364aa10566d2f58786fb19bf SHA-1: 546eb8d3300be5a24093f7cb4d0439a07e7787cd SHA-256: b6c0a06c75718dfd628e88b1fa2c0d773751aee2fd796100d4679267d8bf5231
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites. The embedded URLs are likely intended to host phishing content or further malware. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16078595a525b7---38614940284.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc85c71e12f---74768179374.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5b531336f45e17e032d9a2e9cc53c67d/nomamawekabepezope.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/najitutadizaludokul.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/49521731535.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/junajow.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/62695571316.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9e6a9f04905d948e2df057cd9ecc49/86491145045.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521162459237308.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69f11058a---numonamivoxoru.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/05b564a2c64e95bec4cdc2fb4ad3ba56/tepiduzizanumuseseguxiwo.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/litorokiduxexilowug.pdfIn PDF document text
    • http://intersonik.eu/upload/files/39772667733.pdfIn PDF document text
    • https://blogsma.com/files/ruzajurokexova.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/luvasido.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jovuriwuranev.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/nanuvijomudu.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210606_C0EC68E503C9984B.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/23167132632.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/45124561008.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160affd31d13db---38362352885.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/8204860645.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/fifixajuzujel.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ffd85a3c---petiw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aaeb3988e---97624916297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=multiple+noncalcified+pulmonary+nodulesPDF 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_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 17484 bytes
SHA-256: 1db7856f47b5d43b6a055b421fc74c33f891a881d307841af4c67c7151a99831
font_01_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 10988 bytes
SHA-256: b2f6441379fda56c692ecdcd14fcf905eae2e6f3ce0f5019fdaf54bd4a4662b1