Malicious PDF — malware analysis report

Static analysis result for SHA-256 f908d9c7d8d93804…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 07:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eebae648e1c4af4b0ced9ca813762c7 SHA-1: e78bf59a15da33e9e92937f5f3e80c765daa3f7f SHA-256: f908d9c7d8d93804f5a8b2b0be4c36f1de04bf05052e033a66a82a9ed1bcb460
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://sasalidayanisma.org/uploads/file/56954898981.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f8475851---3229200048.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f27e981c---jibok.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3oqo1vredaspijogqqed9gcja1/wufutajagifis.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7ef49ad90e9e45ddb3fefd5c52a00f5a/xezatamulaze.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c099bbddf32---lawipovapomidedudigaguk.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/gojokabobowugud.pdf
    • https://aonetreks.com/uploads/file/55573438723.pdf
    • https://acgroupenterprise.com/userfiles/file/28259666725.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/10fd82997703868ef9a18125c3dc9af2/denokirovu.pdf
    • http://haohanlegend.com/Uploadfiles/files/57434023820.pdf
    • https://lymfologi.se/anvandarbilder/221/files/tajozepokur.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16071365e5743c---78554901098.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c186a88d8bc---53489524658.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/v843vkcn5hpgabgho5rrqggn81/85004037839.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/jagotejobowetoxigov.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5b790b96393164b5186e0ceef60bff4f/31051613866.pdf
    • http://studiolaviano.it/userfiles/files/bifazorivebepevatow.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3fc64414fa35bce15001e48b6d0602c5/buwopozefesodi.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/c03e7bc42838c8539180228a1a9f928c/64239538697.pdf
    • http://eibich.de/layout/bilder/file/debasaxokowesaguxu.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ba15735e1---30535747319.pdf
    • https://bamor.org/userfiles/file/tozipoxefuvow.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bc97a99d---50634888289.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=compact+access+database
    • 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_off00010829.bin
d711a0eff85ef6a42aa4601ea97c7e4b2d884323f81a47b36a6abf883836cc38
pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 10504 bytes
font_01_sfnt_off00011fe5.bin
bab377f88e4318181dd7b4640b04895ac98574a6aa7b6f1a01bf7be309505763
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 17612 bytes
font_02_sfnt_off00014e3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3C 16792 bytes