Malicious PDF — malware analysis report

Static analysis result for SHA-256 743c8db35477421c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 03:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b49df237f31ff2c792047118aadc81f5 SHA-1: 90d045ed3f2310af744c8f61ee5b4b854b18bf40 SHA-256: 743c8db35477421cb129a749039ef70fbcf368782fdc3df0ea614660d1e20bc0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious content. The presence of a visual download button further supports a phishing or social engineering lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • 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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/369c261c80f38e4361272cb30d07680a/vadejimawibarupoxa.pdf In PDF document text
    • https://uleiuri.ro/userfiles/file/gofewiruxowakevesoxeto.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/65246983402.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xakimariwezuxogujob.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/74755162040.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/43888079680.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/nijivo.pdfIn PDF document text
    • https://fishuntpesca.it/file/vafukika.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/36407656707.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/mefagopesave.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021628244565424.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/97369814453.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e019d470ca8768efd6bfb48a0976e4b7/37782478720.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/bcdeca6c1b680208d2c3a538ca2f2988/65414964577.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/11775234216.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d6o6rerkp117t2rtqkq0oo4ut0/mepigipuzolubetimemodelo.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/49397857844.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/sudujemurutazegi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/35e31bedab3926f1c900340daf8ae7b6/rorukasidaxefodelixufos.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bb5170cbfcacbf38e12ff41ada422451/muwixomesixux.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc588a362---72702244505.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/resuxib.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c97a92bcd---rakujowaxozubedumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+soil+songs+download+mp3lioPDF 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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10860 bytes
SHA-256: 78fbe2631b213f42c5bfdb0b190f637211f607d3aca0f4cf1995b4837267a36d
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 17040 bytes
SHA-256: 5ca658d380a61ecc8364f6497ff53703b5c0bd328367b5161392ef69ebd39df7