Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d70243296cf709f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 12:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50fda7bf822e334e09d767017783db64 SHA-1: 51dff5628bed375333f42bac7210d1d84e1cda10 SHA-256: 5d70243296cf709fa718fcb5428706264fcc6dc0ba91b8c2bc04311e8f544b9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of multiple external URIs and the link farm heuristic strongly indicate an attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb06cdb19---89749073042.pdf In PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/ludamobojojejagume.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/zazepixukopufodevujowifas.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f86b506bb---61224562420.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/zorupibowonikewozawom.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39ed1182b---tebinaworaxipuvifumovon.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/81415873288.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210828161701.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1acac548---dijawamesafem.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/50686355016.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/44845159282.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/vipusaxisibiwivaporoz.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/42606452831.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/fubinosatit.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/62477284624.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160764a10699d2---73728044552.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/4087258720.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/depulawux.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/skq4qb67sl6fr9iijouqsmf9c8/74323873937.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/011tssu2g1gfl7e6pklu8n0pd7/govoxavar.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/2794065673.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84268544499.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/temumakobelumuvi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a5c4dd22c33f835f997d88f1b19ace02/wuxuvanofefegurewe.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/onkje22b3bu4fsf9cfuo17qcr0/46323405578.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gs8lqsg3hpoiirb73gmci29234/81219506697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=amines+class+12+ncert+pdfPDF 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_off0000bdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 15884 bytes
SHA-256: 57bbfbd71f43f091a65ea993635bc4d52443c32ed33bd297d2b74688812ec067
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10816 bytes
SHA-256: ed423e23f723744dc53cec47cb84bb0fbb37a1c38464ab6a9e79eb2b58ad4537