Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fd8b8cfca38eb9…

MALICIOUS

PDF

82.5 KB Created: 2021-08-21 14:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdeb8d0bc88c82e7a09efe7177d838d5 SHA-1: 3d73ddcffc757fc94fdfd62c4984958e42c4cf9a SHA-256: 56fd8b8cfca38eb92f414efad5099576e8506daef7c280b11e2c8108ce74da5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute or host malicious content. The presence of embedded JavaScript and the extensive link farm strongly indicate an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=big+ideas+math+algebra+2+8.1-8.3+quiz+answers PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/js0dalap8coam213ds27ppmld7/bivefe.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607915f038b74---nerokenubufometos.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/40312881853.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/99239907328.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/gafozenoxezanugubuxe.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/beded37b94b4b95942a34ed1c7f5fc27/feravaroj.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/91748683254.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c2ea357200838a346ab7ac3d0e4e2409/96477513129.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8er13105u4rnbmqfia2v96icpa/sapujowa.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/95989436148.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/zixilutiwoguk.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/25085685851.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7438a62e4c309cbfa47aa12acf2ec4a0/68602995035.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5010cc5f99---56895052612.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb63d2f316---dovetupabiduzeruje.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/pamagetakorop.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2d214b7a9---71095553899.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ikpe4vkvrvl7tjbvir179f1185/74327122569.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/65236274440.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/94369238451.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b87d6471e---13874271497.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 11812 bytes
SHA-256: 518d41c838c3b4b7d948be583ec22ec9a4900e537ae67ca086efa18f6cb5b5ce
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16924 bytes
SHA-256: 8a0b56f122cc99d746e35290eb3d2fcb730722faca2c51058b4dcb70ed8c6f72

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