Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6a7e3ac90fadb5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 05:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e66c1b93d5e6d328929e12cded34f18a SHA-1: f758dff9043ef6809e1812f911c25dec7ae16d40 SHA-256: 5b6a7e3ac90fadb5b6d61c732179ff91c1d06588f0134074a74b88ac8e8486fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130690eab4be---fazolorewi.pdf In PDF document text
    • http://mylodge-naoshima.com/images/blog/file/kizatebumokopulifezanijuf.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca0177f3a---21114994894.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/budiroxuriwadexopu.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/95190096173.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/doponezageko.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/golusel.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zizegi.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/53142057352.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3ea9e81fb697e33efc8a9cdd5b001efd/bomumevajukoxeforozaf.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/884070175.pdfIn PDF document text
    • https://olterus.com/contents/files/kizarerexipev.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/dawevoluvojotazunipisa.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/66409911776.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/romatesiruguzitara.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/vosolavajisosejax.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/83945122659.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/73347912034.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/90249710453.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/mamegokatoteze.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/55058427797.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/62296689561.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/36983333078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=witcher+3+before+you+playPDF 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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 17316 bytes
SHA-256: a60c580b9c5e7b4096b7c4563bdb57b95c0e91b147a9cf7f2b9358537e34b4a2
font_01_sfnt_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 10824 bytes
SHA-256: 171e5649dfbe1ee6da0b973a11d2aa9db990ed441eb67e50e61a3dec7f86a34d
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.