Malicious PDF — malware analysis report

Static analysis result for SHA-256 400106dfba9ca40f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 10:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6ce116bb92d7648c9d8ad3396b3df82d SHA-1: c0ce83a6b08938f41a8ef434cd0bbdb008bbc0f9 SHA-256: 400106dfba9ca40f4008340b562aeeb5f0a7f6da61be83599010f90783f4bb2b
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly indicate it's designed to exploit vulnerabilities or trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/56e20696b6f5479889ee99d19987778c/sutogetorot.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/92845171628.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b8413e20cee091938149cb2ca507251e/82791291777.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/dunemox.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4719bec7b4---43073233832.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vejolemaresezuzejer.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/zetowevekifodopoxuvonolaf.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a5e140ce---duguvodejujoxaworarefu.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/tirifikamupinaronibu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607755e57cbbf---bobis.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/54231434446.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080d07b49ed4---lejikebiwajuxepe.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/rixixekotube.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52679207495.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/6938717202.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/495956147c2358837d89036816f14109/46733814428.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7dd5d696---kokines.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edd3eb38559---mulebaxiduvezixejoxumaw.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/xotowazokokezoxuluwi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a34072d51---jozokozak.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210514/file/16209465492619.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/26334984132.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/nanufirufitawopov.pdfIn PDF document text
    • https://tcremich.lu/files/files/wunagimodegupudume.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pd9jnvge0vt51vv8m8df75vsf2/78093180981.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/61012349928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ms+excel+to+pdf+converter+online+freePDF 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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 10612 bytes
SHA-256: 94c7e358a6cc133ec914ed08ccc13d18e9206ff0a7e8f683b25f22bd2fee58c7
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 17556 bytes
SHA-256: e671e1bb3abf1c8054137dacbc60f9709089cd1ab2c749984f22ef608ac8fc22

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