Malicious PDF — malware analysis report

Static analysis result for SHA-256 2719e4d91eda8da9…

MALICIOUS

PDF

93.4 KB Created: 2021-06-28 01:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d129ea206e5f4cf7ecd227f12bfb7807 SHA-1: 7c8610e49d9855f7d28980f68ff8970faf5e8c3f SHA-256: 2719e4d91eda8da90c2bd212cc6567bc2bf3a235a08ad7f8176fd75336a33642
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=small+clawed+otter+size PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607681d004ee3---foxibepamuzuw.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/19410627325.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bgok1q88qou7qkf8u0vlf6j872/58152123865.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/46082683758.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/14195544815.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/wivowazigaselenedonidekow.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jgkakfi26pfok1lhhpsi6llart/72259787067.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/madunuzisalasojita.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/6083924157.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/52171477016.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59fbcabbe---lakifovu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/wuwolumativamu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d05bc31a0cf2dff23107d1440aec628a/nivupebawoxepuz.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b93622526ed---gisofigururo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54d30b4601.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/zurakilako.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/18539350843.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e62bc64f---62639790732.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609332ee21300---17775184567.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/sagugojitojow.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/zekusutomaruk.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/91398546484.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9ae5acc1ad0bf1ee7807e5c4989cf93f/wumujarot.pdfIn PDF document text
    • 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_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 18168 bytes
SHA-256: a69aca2f89986b989f78fd5a51beddd2836c3d8f5ad27e147737e4b4adc34c1a
font_01_sfnt_off00013829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15040 10648 bytes
SHA-256: 8cd62dbad368a323fea1964ba50eca9fb5ac98c6e5fb911799e6d8302ed37a69

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