Malicious PDF — malware analysis report

Static analysis result for SHA-256 1289c75ad927557c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 17:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b77933fc9df8592c7c7a0471ada4a3ea SHA-1: 8a0401617a27b7f78ee20107c0f48d1560149893 SHA-256: 1289c75ad927557c1379f66ea5309e223e9e4c6bd94ba48616e9610e3f871ae1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/35947fd70e1e12eaf07551753ca6eb2f/fuvatarolot.pdf In PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/3333943fc1cae3a7f0337ac74838d114/tixirerulotasim.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/guguwixurox.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/vinanesegu.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mepajenegepa.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/11781115148.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/26798752115.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5dcf0bcc57fbc60b1c4dd315bbdbd6a0/92775628681.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161169eb2b7f36---96782551683.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/79709123053.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e8609098---74231944624.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/25827831400.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bakija.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/nifenivorebid.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/68213642383.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/11755780359.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105021123367605.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6k57btppd1l253kmaq5526qg4p/32240425031.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/83262254030.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/50000328393.pdfIn PDF document text
    • http://93564497.com/userfiles/rujavadiw.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a11830f3cf3---totojutakinenagoruwepap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=caixinha+de+promessas+pdfPDF 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_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 19376 bytes
SHA-256: d4c0a315dead6bc9078dbf19fa31017214399a465af95579f1bd5546d4f13fb4
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 10752 bytes
SHA-256: dd4b0af10c76b5bbca05c6ef820b9c3dcf5a95e3c3b0fc4d144ca4f8887639e6
font_02_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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