Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d521732eddcca6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 20:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db3fae8340b280f683b19457182cc986 SHA-1: c83aa8203605995a46de3b2e464d8b6eb750bf5a SHA-256: a0d521732eddcca66eae0bee40e941a4c69691ec54e01298f5794408f50ea8a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of JavaScript suggests potential for malicious code execution, while the link farm indicates an attempt to redirect users to potentially harmful content or phishing sites. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8960bd00---12333805444.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3dcc6f76813da9ee989c616eacb3fcbc/44479653787.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/dalev.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dg9m49ah0b3thqvqpo94b130r7/13688111261.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ea45eacd4d1be6b95500a33552fba088/durawoduwuzuxogadud.pdfIn PDF document text
    • http://muszempilla.com/files/file/61089144739.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5ac6d6fb1bbbe488c71f515a8afdeee8/xebupadapugopusisedubi.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/deperorusife.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8cf650dab45e41ed63bb386c57315a3d/xisiwebiwomut.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/sofamekizozuvo.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/64051681172.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/4870363119.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/xanegozefatid.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e6482cee3a96c29e05bad7b79df2fb64/49796112921.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/50832968aa2b292736535011fc0d63b8/21224157956.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb41cb5573---fugatim.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/robelosezasabujil.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/91912192388.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129ed7124f65---fubemurot.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/db088c4ff655783defc2f37e8e33de4e/15770089435.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e35d122ca6a---nepokodatesidutazozibivu.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/58133816148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hewan+avertebrata+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4f6a1b95---70997310929.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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 17296 bytes
SHA-256: 86080b9ed71a05cb94567b6f25c4e7e63a9c8b7ce77f9935f3a4bbc25db01709
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 10348 bytes
SHA-256: f75f116b561064cb63aa0b3de54aa4aecf1903fd79ae9dbd4965215dbab1ca08
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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