Malicious PDF — malware analysis report

Static analysis result for SHA-256 533c0ee46f844920…

MALICIOUS

PDF

102.1 KB Created: 2021-06-26 16:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 64b2fb672dce448d8e782b29b96603bc SHA-1: f4f7984828dca316318387c61d64ac56e93d72b1 SHA-256: 533c0ee46f84492050d837270d3c692a7756864dad63e60ffcdb95f3beb146f0
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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 https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7de225a3583163d71441730d2450647/lekusosakulizedopevuwago.pdf In PDF document text
    • http://jfe.hk/userfiles/57646373226.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/80120798228.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/dinoxopap.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8ikq785vvgjntco2m94r45cg8m/xiboluxi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1b4acd9fc---22278179286.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b264214d0e7---mofegutavurovowa.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rqf1vv3m9ot6srle3ls2s94004/fadufopimefilagid.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/de936e7e6ee9f789ee2accc2c4fe4bca/32993756875.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/48165131576.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/72045434091.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2e2b055c33e4007ba826c10acc9bbd2e/53801290674.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/53355054874.pdfIn PDF document text
    • http://short-story.ru/upload/file/wakotelesepufom.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/78055198330.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/dc56b40412e0ed0755f4a9cd1a748da6/78830806741.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd1f870e3---34377715915.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160871d9a8eca2---sisawirazokom.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/91315073576.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/52012703498.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xidugewasuniwo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/dedexobumofasaxu.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/16250937956.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b039fa761c5---zezowumizaluzefomima.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d1a75a5a---losapidadudaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=combine+word+to+wordPDF 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_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 17860 bytes
SHA-256: 935b15ae53fed4a52d6df8e7ee98caaa7ced8b1aebe2369f64c97874532dfad5
font_01_sfnt_off00015c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3C 10288 bytes
SHA-256: fba460d1e61bf0a0d9bbfabf54fee833cd0ff2455897b01827adfe9cc03a975c
font_02_sfnt_off00017368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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