Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90190563b39c6d6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 07:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17db7d93297f941676244033652ddcc8 SHA-1: 137de1e3c46cbbead247d3c84576540aced25d89 SHA-256: e90190563b39c6d631e415cc83d0e1c4f057d9b39640cb6297af2a64932c62c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/50609669113.pdf
    • http://kashima.cc/userfiles/file/82617642980.pdf
    • http://cementfeet.com/userfiles/file/gepakujikako.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kq2kh0nshpo2n3holrdtpqrp46/25614635808.pdf
    • http://ristorantebiscione.com/userfiles/files/80022723721.pdf
    • http://a-pluset.com/userfiles/sotapemuxotorigodubaxeg.pdf
    • http://bularz-auto.pl/images/userfiles/file/32409563174.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be1f9876a---topev.pdf
    • http://daieimotors.com/js/upload/files/49508499065.pdf
    • https://kme.pl/global/app/webroot/uploads/file/1629838973226.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/sorerijanafewesud.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a3c50d29894595f2347d7ad9819c6c98/25766041865.pdf
    • http://studioingegneramato.com/userfiles/files/xakudimoj.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160745665d8fe2---35217486312.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/91543273115.pdf
    • https://geneticapanama.com/userfiles/file/junadowamed.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/norubodikep.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe9ca33d4---ketarigizumeretujop.pdf
    • http://circolonauticofavignana.it/userfiles/files/94825310233.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e91c00ed9dcc38e61b3f5e0e00d3b5d/nidutemipilixe.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/pegetinag.pdf
    • https://atlastoursntravels.com/userfiles/file/gekikobudebegopibowe.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/557174612250e04f2ac3d971e0e8ceea/rinana.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=analisis+gaya+bahasa+dalam+puisi+pdf
    • 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_off0000d2c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 16792 bytes
font_01_sfnt_off0000ead6.bin
501d68339c3d022ce8d52d49767cca496fc9b2a43f5bd28000bb6f25cd333e76
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 17240 bytes
font_02_sfnt_off00011778.bin
2779c7a76d35d6d365872644a614724da60dde06c7821bd8365336ebc402e997
pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 10828 bytes