Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e3cd04c7bec8dc…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 10:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9fb434ce780214259e31b3e273ea5de SHA-1: 3512ec5dcd11f002e56972468b1eb8e30a383b03 SHA-256: 56e3cd04c7bec8dc32aa891f19085794fc6a313dde5b58fa38983d49828697a9
164 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the presence of multiple compromised domains and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=ubiquiti+unifi+ac+mesh+manual PDF link annotation
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ab9b593e39d25a8a00d17915764e4ac0/mixusiwifetogafajugu.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/livoruxox.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f476f9445db7ffe94e71cf5a20dacfcb/gusopobuvaxepofi.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215231856429968.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/fvb8f2on8r9gp3jmqtqlubcd40/19536097202.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/10703773264.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/75235480983.pdfIn PDF document text
    • http://amajyuku.com/files/files/35680048321.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/1512716166.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2fd6966060af15b9d24999531c66e471/45524647411.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/mamapujadeked.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b831d005411---vewomezepirobudizevikaf.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mj54atic80lpgoj0sm8sbk4bek/jorejixajeluligez.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e15e8ad8e84477bb17578ac640901f2a/safunuxipopujip.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/25327536325.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b67a7e1053d---kenefiximakisinaw.pdfIn PDF document text
    • http://amdind.com/userfiles/file/samivigojumupa.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/pexowimagemuvepaseletabez.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4885e64f169958ad1e8b0543a9efe09d/80125198971.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/vemepo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efab7c0d16---jufudimipelekugozexexozeg.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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 22876 bytes
SHA-256: 0abc5632e3cc8c480fb98c1b565518efa78e6f04c7391dcf4ed83745bfda2c23
font_02_sfnt_off00013b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 10772 bytes
SHA-256: 44f32c55cde761518f87cfa0a381c896ff2a8abc2b930ed2e4c426976676d433

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