Malicious PDF — malware analysis report

Static analysis result for SHA-256 40865e18f832110b…

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 16:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ac9bf689e351f7a28b4cc1daf71b7557 SHA-1: 56c13b0b626a1a63c1552fc1cf6f1c8adc3bb60f SHA-256: 40865e18f832110b94d5360941fb6b4dfe9050061925ad2f0936e31d35d0db2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. The primary function appears to be redirecting users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/23310654073.pdf In PDF document text
    • http://color-gateway.com/userfiles/file/vibivozizosigifowuk.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/75034831607.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/70c0cd1b27b7673a9fa4316279ea981d/panuw.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/jokadaruguxum.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2b32c69c---musalew.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094368948a7b---jarijusukujilet.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/65628913f62096a309e609b94d92b641/28013285309.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/4364276866.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xujozowixakurajitufumab.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202166618449987.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rif48okp8esbrdkk42thfj2bp1/87458286324.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cae971d83---30865473579.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/86565586302.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cc142c60---24005856151.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/00pukb6mqgmdjoh2ic4hs0bll8/linepigebeju.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6dfdbbbc3d000be8a9d7f98bd34eedd6/37243524172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=we+can+talk+in+englishPDF 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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 17324 bytes
SHA-256: 912310f0e2db4703cf3cb43b5c2b9cbf093d07cb822b6e77b099d18d00f219f6
font_02_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 10376 bytes
SHA-256: 71d5735ff62af2e02b73ba8b6a6747646a55fb9a4156bd4610e0e9b57e2d1b1e