Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba16ea7a388c34d…

MALICIOUS

PDF

109.3 KB Created: 2021-09-03 17:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7dd1ea8dd3930f880dafdd1c7cc62131 SHA-1: 3161f7e57bbb8e172b304853ff9d302db293ccf4 SHA-256: cba16ea7a388c34dad83922445f8ab7eb7696e3222169b33c9eff349c28e6375
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/68101727643.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k335ojndncmiqqp0641m96h50n/xabuwoboluxuro.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cd30b928---xogetowesipejejulixisa.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/galor.pdfIn PDF document text
    • http://iwishop.hu/file/nagunubedugokazanem.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160703f857a2f6---94200869134.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gid61f39lo1kfqh88amproa1rq/gowafebadutipafufex.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/49308167259.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160731e906ac3d---20018152285.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b7c264845---zojatadivefobegow.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7353181f8.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jc2o4d3mspncm6iktuv9ra12v3/fopumafujirufikuxita.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/en5ap26qpeksd1ag7mdbsvuota/18479024245.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160965fb60a774---10265393494.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/13908219903.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210830_73F7E1AEB09A177A.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f9043df43c7733e82f382912d947d941/xunatelamoxomijababazule.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb46618a76---kidozoluragasidabeseb.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/riganazikimutixomo.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tadikevejejudekobukonogo.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/pilimuxakuvolim.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/aec44c14b4d6e1cb9f427a45f2366d59/44256542430.pdfIn PDF document text
    • https://gangnampools.com/contents//files/87943111982.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/62122165904.pdfIn PDF document text
    • http://mega.kz/media/upload/files/38129774024.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1f4e43f1---40136505515.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/78231892119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=practice+reflecting+points+in+the+coordinate+plane+worksheetPDF 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_off0001447c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447C 11080 bytes
SHA-256: c1257f8484bc342a7408fb96a441aea042b8f8886a5482bbd95195cd3a71af24
font_01_sfnt_off00015e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17627 18704 bytes
SHA-256: 56ff343fb290a6d5b27df0eaa7ba7dc227b85cdec4c0a92c788843d57112ad8a