Malicious PDF — malware analysis report

Static analysis result for SHA-256 198b4fcbeb894d51…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 09:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b8750c2e316f9895c52722bedf1a0aa SHA-1: 4eba0def2fabe849a9eb539fb98fec62cdcba876 SHA-256: 198b4fcbeb894d51ae5bd316021b93dd58ee852008a7c3c3cae942598ed66306
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this intent, while the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. No scripts were extracted, but the overall structure indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://serbanindustrialconstruct.ro/uploads/files/27748034163.pdf In PDF document text
    • http://ibb-online.ru/f/file/zulunipub.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/84325379101.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/59370932869.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bffde18ecbc---batoxokiruruwato.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m8cb0vhpimmun52rgim5s8kp7q/14898494999.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a1979e46ea78cd780733c5ad83a0d758/21774535171.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/xadaneguvarosojudave.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/61769619778.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/33779765239.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/785625579.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1a2e0d9f---19205746274.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/tijawuvu.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/ruxuj.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ad22f3584---69760510157.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/gapawasara.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea971f2006---rupuko.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c7c738a523321a2c86afaaf942d8b7e4/91750271817.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/92941945528.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/nupufefazajusezutow.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qnlks7f3bl1mc4u089tdi3jlsl/vuzipotelawukikifofimi.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/pemigikedixojikuwozal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+cracker+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 18592 bytes
SHA-256: 1ba6113c5582ddfe5c0a6a58014b0699e64ce484ef740f4e2f334ebbb1c48975
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 2188 bytes
SHA-256: dfcc997ec84e092d8bc3879551f29dc6441c140af20b69c87b48736e5545a3ed
font_02_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10296 bytes
SHA-256: e379a0fdebf37cf78dfc5c4d242ec15d39f226afad6d24edbfb4b5c688d097d4
font_03_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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