Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1178720951e253…

MALICIOUS

PDF

205.5 KB Created: 2021-07-19 09:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 078bb353d05af31eb66bfbb34fc8b9fd SHA-1: 5f31cb3a4c84fe959c2fbf39050e4a461abc3908 SHA-256: 1b1178720951e253f3daa3917c83cb2b316454a663b003891a093e4b81a36c8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

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.
  • 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://volvo-cars.jp/js/upload/files/katumoligugoke.pdf In PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d73bbfbc9acac29bfcf8c5c176eed2db/77254325386.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/9037748.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/fojijotesapumez.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/27468921948.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdbbd6d157---29593476607.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/91616096082.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f869d4d4b4---23702070888.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796b488a6ff---nologajizokamo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7f66394b---26757936263.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/85482190457.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/52259473381.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607959a2878ff---89399119752.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3e2e6174eb62f1d95eeb3095c96df5f7/xiruwurow.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4m5g49r6d1ldrofgq43d2voapo/jisiwup.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vhq6ce5f2qfo88a2js090d4ci5/powibeleneloxo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbef0cbfa2---wunadenizanowomekirupido.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/goberobutezobubimoxog.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d1fd7d38b---lokemix.pdfIn PDF document text
    • https://nadamasristorante.it/file/43936337427.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8f9jnp7k3lphplf5dlocdv7d5p/lafap.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44672c29c---33918083166.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/86172987591.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/18bfe4fb444455db504fbad3e5a596b2/58049290431.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754b972e1f---samak.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/47004828602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=personal+experience+fallacyPDF 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_off0002c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C875 18316 bytes
SHA-256: 465a53bdb6afcf98b7337a782dc74108c0ede66a16a3e429eab7b2284c613cd1
font_01_sfnt_off0002f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7F4 10592 bytes
SHA-256: 6c9eff68b7f36b707d39b799ef24893a859221763abf2dd839f041c1b7490d81
font_02_sfnt_off0003104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3104B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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