Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce4600fabe9d481…

MALICIOUS

PDF

69.6 KB Created: 2021-09-03 07:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 644d1c5a991714dca6dd105af6df1941 SHA-1: e1fd990387b062c5348c0e4cf4dfdae053a6e214 SHA-256: 4ce4600fabe9d481c59899e7bed3f435fa999f01ea9afeb78fc1a643205eca42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cissud.eu/uploads/ck_editor/files/50190038583.pdf In PDF document text
    • https://petek.biz/resimler/files/mizilepejukedukutisilovo.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/vuxujenibuk.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc58aa380fd---57479535094.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/60115292601.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/32996040402.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/wovijuxonodopoduja.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/bamametage.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7835605b4e---larebinenovapixudaser.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/39409125717.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ca42fb93342---2894575485.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/losefopijejuvukija.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a253b268c---tetibujojirufogogarilit.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a682ec39a8---rapodejivorerewakof.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0386647f3---96367752630.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd841b08782e10fc89517da9f334cc7c/94691213676.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5c4cfe3659515075ea13e4ac736ba3f3/91746237711.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/95666760023.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/konuxibebovi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b16970352bd698dba8c15f95a16c6012/fikiloditi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/22560615059.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/woposasomij.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/65511132271.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/neref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=telugu+novels+pdf+books+free+downloadPDF 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_off0000b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB184 10928 bytes
SHA-256: ded6bd283bff094ec7c730b8651d399158b0c19ca22843e911d782dcee85dbac
font_01_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 15012 bytes
SHA-256: ba8f2a6e51f1c6639a8a980d214ad4425de055bd04157fa9dc1ee9f035dd8fbf