Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fbc0a8d1e72670…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 03:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a281bbe2af2cf9b3ffd73086432586c3 SHA-1: 7fe1c435abd65a7859e6194b4a11e16af20f0398 SHA-256: 88fbc0a8d1e726705c150b8550fac4860b83e3886ecc6935328231909fcea5e3
204 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a link farm and a lure for a password-protected archive, suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links to potentially compromised WordPress sites and other domains, along with a specific lure for password-protected archives, points towards an attempt to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/kemavaliwuv.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902fe143d65---jowaferojazarum.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b857f3e7---ganazepefobulobupunul.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/39187833274.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210619_100504.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161197e5c5da8c---fenasuwij.pdfIn PDF document text
    • https://profesa.net/userFilesfile/xumuroxewoxosusuj.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l0u565qfs96vgq06krs55aobck/63615296233.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112df47ab5e8---83948487062.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/29968941445.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f644265037f982bdf84f7e43ac7c0b9/xojejegofitat.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/suweremaloranovanotorodit.pdfIn PDF document text
    • http://citra.cl/userfiles/file/92430751656.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/fupidusubakit.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce800868d7---jotuviditumurugiv.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8cda9c5572f77f06c61e60262539b2c7/lobenifozakeranomenigeku.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/87596649000.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/51834157137.pdfIn PDF document text
    • http://cochu.net/resimler/files/nitezisasime.pdfIn PDF document text
    • https://istanajp2.com/contents//files/furadirepakupegogibulobal.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/99043123462.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/wejuxuzefadegera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=crack+wondershare+pdf+password+removerPDF 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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 18344 bytes
SHA-256: 436e469885d98f0609b61d08cd58f65fde02dcc8c91495b99f242e235f68ce6c
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 10924 bytes
SHA-256: c75552ac4a4ea8263b010c81f810be864a7f1e7dd4d03198a4515b61812dd619

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