Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ca686a589f3cb1…

MALICIOUS

PDF

81.7 KB Created: 2021-08-05 22:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5efb74e4a53e9c70f2dc64ad81b612a9 SHA-1: f5dc1b2b70d4c49345025a38f73563ac84e8cb40 SHA-256: e1ca686a589f3cb1f66ad59910de5ffe3431afc1f76e5b2ef92841c560b9c15c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content through a chain of compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6e178a03cbbec1b33793f2677aa48479/14558310272.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ximagibegujibo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f53abcc3a23719b0800156490ba5e9ab/kixupesorepi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/97452111674.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16092edd42a1d9---xigubegutemizonewisa.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/58786511521.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789b09a8---9571092771.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///desolovefebekaveru.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/64581665519.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865e811b36e---dawopoxurotup.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0f2290f5c2aee56ff399d65045858adb/gekewexukugegirutesej.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/87a12a17c0f0ba2fead7a4866214b9c3/67742644120.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/xukaxutu.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/17477829961.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/xusuzizipedirupigevem.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e70ddb06---82767554531.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fc6ea4b0c01fd1f2cd5b93810e0b51a5/savebigavu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f13bf415e101f7ad97d70ec56456af0a/97028237288.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/gaxatulo.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/33598cc8f4707a01c4af6047405a5d45/sadebiruvetakasifo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/cc94ac6f7f2c292c2a8e2c562ac93121/xoduxenegupadifibopiw.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/44883148058.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/defunosow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=o+quarto+despejo+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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 19252 bytes
SHA-256: cf6f2efcc4ecfd40af14cde23cb39c8bf92476ac621169cdf677c7e508e285a0
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 10648 bytes
SHA-256: 9f0905cd93394665d144d89d24ce010b215c4eec721eda740e22ffa6d1dfc999
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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