Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff8780088d216d8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 17:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08368258b3cbff12b75586352975bdf2 SHA-1: fbbdd8540161c8c7505a772f3fc17d64100b9be2 SHA-256: 0ff8780088d216d86b38cdb160f7bb14eb462ff1a3dce3a802846557f4d9ef0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://theprofitnesstrainers.com/userfiles/file/28237927006.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/lokojifesuzexuvesas.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/80613910868.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/60834443996.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/8489454633.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/93137339524.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/jedepiripimerifuligalafuk.pdfIn PDF document text
    • https://ratodua.com/contents/files/xidamajedev.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/14554649577.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/lonosiruvuz.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210914112108.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jasesi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00722009d---76392232830.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae66e5aaa---37175617972.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe9ac05ff---bazatezi.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/bisabo.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/somulipumu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133211d9f4b0---76137435036.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7f3e5fac---2673204626.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/81784394031.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/zenupomumixikibixiwesigu.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/97869853081.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/3973405453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=episode+choose+your+story+apk+downloadPDF 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_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 10988 bytes
SHA-256: da497528579190b4b3b33ef7513f551f1c143492609e5c7757224d20e0d91086
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 18988 bytes
SHA-256: 56c0afc31e118a4bf77e9a8f3ce8676c36712cd5ba943088c6ccfe6414b2c15c
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1