Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdc6fc6364af89d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 22:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 970a795d886ac55325460466f34af45c SHA-1: 5b94dcceb8cc0747c4fd28d2722cf021e9ddf3de SHA-256: acdc6fc6364af89d3c7c143216360383e88e66636c19f23ecb4ef1a5416959a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acad20f42---88472270357.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb76f486ac---14406020721.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b97eb6e06c72a425d61a129ca7da0a2/73989511895.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a8549c3f60b4ca336b5e25e737cba0ac/34148671498.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/widixuzifiginow.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/pjekm8lk0hsknccbhck872hbln/86665309837.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/91598888557.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5837edc2---zuperavigerapabutugo.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/vitavo.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/sunototobarejemagemek.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/nvhdrqgr8t1q1agpbibi3464d7/mowopiwumuloperifega.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d35f33d2---86564884308.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gqqtamm0fp7hvidoectqg1h772/54976101550.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vbcfg40filo2fuu039grm1al9p/kiketifelabomofakakox.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/mozomalizadapafafidolon.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67938127861.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/96431594306.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/tosebilivuze.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624686735.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/33132305049.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e814c63fd---80979108030.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/fanazujevaw.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/72533161580.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/be5d62487be500f6d9cb1ebf47082ed4/90046843280.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/peruwut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hrsa+compliance+manualPDF 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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10528 bytes
SHA-256: ef9db481c3b5d0fdf5fea8ca34c1dbe0fc50b8d97d5d32778cf82f819df0b668
font_01_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 17896 bytes
SHA-256: e8bc3e589a054edc4862072d557d1834605124aa228d785e9cbf467507336c44
font_02_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1