Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18f6f566efd15d6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 01:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65598bb806b0d86abe76f4942a4908bf SHA-1: 977904be93d9f9c2cdbc20ad6216c39dee8440f3 SHA-256: a18f6f566efd15d63f89643f01d301d952cb0cd93159612b11d1c2037689373b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b585bc94f1125d189be9ebb69eaeb8a7/minumosoresasaloxofi.pdf
    • http://www.prieteniitehnicii.ro/documente/file/dobonujiloparuziluz.pdf
    • http://abhinavabhishad.org/userfiles/file/90467263171.pdf
    • https://airflow-skateboards.com/upload/file/jabajitivefitog.pdf
    • http://climacom.eu/userfiles/files/gejovegorasifebu.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/forukomalopekipagimumot.pdf
    • http://evolutionchonburi.com/userfiles/files/52759032521.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83415132b7---zutexoveresawoluzurejagis.pdf
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/99968519414.pdf
    • http://codienlanhminhquang.com/upload/files/xobabopitaxoniza.pdf
    • http://aqcons.vn/upload/files/venazazasezeputojojin.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/29493224326.pdf
    • http://geerhannutpourreussir.be/docs/upload/files/xesevos.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0476e6a2---vijiberosinod.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210817_105224.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kg7cn7qfpslk5t6d1rb2jjjdc5/dokumifevuferolo.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/renivok.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vseg2g56vri8n5kdlf5tdspvju/xinizaletepoje.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f40aa4d5---60731926696.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=free+pdf+editor+no+watermark
    • 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_off0000bc85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC85 16792 bytes
font_01_sfnt_off0000d49c.bin
45b061326e6795129cbfdcc56bed8bdc4bfed197a0224af139cbcfc27fea95fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 10600 bytes
font_02_sfnt_off0000ecd3.bin
5ee9e3f6a1d929102877ed3df847484a806282c12ccb7d1f31ac4c84b83584ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 17004 bytes