Malicious PDF — malware analysis report

Static analysis result for SHA-256 295c1e216d4a9fcd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 16:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90ce455ba021e5b38fade22a9894cfb1 SHA-1: a43b027e6c73b184a4a8f76ce5c49b1d5bfda975 SHA-256: 295c1e216d4a9fcdfafa232c07ed921a1e5b0df1844070e8d66c26b5246c76bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8adc4161d9c35ea8a9a44552ede1242a/vewoxugusaporekoro.pdf
    • http://www.workbythai.com/admin/assets/images/jibapaj.pdf
    • http://prosefkuchare.cz/userfiles/60186736217.pdf
    • http://torgoborud.org/images/file/nexixiriropigofowowawiw.pdf
    • https://ibextrail.com/editor-images/xopipeluj.pdf
    • http://kleinschadenexpert.com/userfiles/file/rakelifafaludakakitogule.pdf
    • https://mangonebike.com/uploads/file/nuxuwidirivebo.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/pivusebiwuxalu.pdf
    • http://jfhcoaching.com/userfiles/files/wusuloxajoboguloma.pdf
    • http://groupelamiri.com/uploads/FCK_files/file/58443956936.pdf
    • http://professional-tuner.at/uploaded/file/73228440499.pdf
    • https://andana.us/files/files/lejuruxorudokup.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hp3mb8vfiv5ikig112ibjh2aufud69q0/lojepabojanenulo.pdf
    • http://ahcxdq.com/uploads/file/080837565322.pdf
    • http://fireprovietnam.net/luutru/files/84443628071.pdf
    • http://kfoodntea.com/dataroom/file/90380118704.pdf
    • https://agape4u.org/userfiles/file/zowibasapukuxesonejuvo.pdf
    • http://think6.net/ckfinder/userfiles/files/20210905114606.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac0f36e5a---nujoxiwiviwajulerek.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/25352164995.pdf
    • https://valstybestarnyba.com/upckfinder/files/pubunaroxedipaz.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321cbf30a4f---xikiw.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/zimagarun.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/goguwubazepujujowegogupef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=viral+icon+pack+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 16792 bytes
font_01_sfnt_off00010360.bin
8477ce87a5d289ae990e6d4a3d485bb72e7c4a023dc18c6836564d594e4f6b33
pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10032 bytes
font_02_sfnt_off000119b3.bin
0367480e42ae7717b663ad144bcc005df01b9882ab34f62a7f989b04bd2549dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 18112 bytes