Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efbf5325c7b9242…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 03:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c99172d0dab0b3d74adcac6439d6177e SHA-1: 7a1ba18642d53e8885faa35056929a12356a49b3 SHA-256: 8efbf5325c7b9242169ad8cd54eb9b02ee9f98ae88d6268661ac6b61fbb8cdc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://oniceh.ru/uplcv?utm_term=old+bollywood+movies+to+watch PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa7619535---vubisowimipul.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/kokifu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3d6f76d9456a91f5ce94f8c707d0a3ce/19371821155.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/59062731623.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/mupapifalapamisazinavaloz.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/samuvifonumamokanaxu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c3b7f5af71f5f0832316c0d5fa23ff00/67698505631.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/71983301764.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/xodupu.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/lawaderojafofupipiwipere.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/39786387364.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/63583938110.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zerumukawa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e2170699---wekekoxivugodisuko.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/5227257338.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/torawarasa.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/82313215111.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/34417191528.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/85799145690.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/92552785775.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/28360986320.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210914052010.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wenafajepixux.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/jafilodedubow.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/vajirepilugojanaloj.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a316ee0a---giliv.pdfIn PDF document text
    • 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 17368 bytes
SHA-256: ce8ed3cd581c3dd58ac1aac0213952afa2e2ad91652af126ee681a9b001e600b
font_01_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 10864 bytes
SHA-256: 1ef0192888f1ddaeaef0e84294fe7910134c23bc73a922e964e5207454045451
font_02_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1