Malicious PDF — malware analysis report

Static analysis result for SHA-256 284869cdb3898106…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 20:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7eb398fad7529f4d3a8cac64f0d830fb SHA-1: 415a406a8509f9d44ad651d3c7402e88e49b576e SHA-256: 284869cdb3898106c5e305741e705296306b94cc87afcdfe4c3b3e483cd39e45
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to distribute further malicious content or phish users. The presence of multiple external URIs and a link farm structure strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/iken976efcl0sb31ifdf5d9r2d/musarewoviberizidefa.pdf In PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/95220632723.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/xesibe.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mm47kh7el7emjq0tbugqj8goj0/86821517883.pdfIn PDF document text
    • http://zerosquareonline.com/file/tutopufikitadula.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4e3dfc93---51506765786.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210714_43F384977758551C.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981330d1653---solovaz.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210527_C577BAE223CA69DF.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tubufitini.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec4d94478e---1709773335.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/dikiwusosurigeniwot.pdfIn PDF document text
    • http://juentai.com/userfiles/files/54048427135.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/81666996427.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607641130df78---xosikezaganeviwek.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/tugap.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/kaforilesemeseverazofoji.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210702023614.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/jenomedekuvidolesem.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/zitibotojuz.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/samivewiguxe.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/92453688053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chestnut+obstetric+anesthesia+6th+editionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 4500 bytes
SHA-256: 853c5283859e02bbe69c7c23cd5e0647c6722076e41c0170e2f2e32202f00f6b
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 10860 bytes
SHA-256: dc70479137f7c86c153775aaa0fa45addaa7097cebc05e3f713426cf57efbc9c
font_03_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16668 bytes
SHA-256: 11e5c87f7f099541a94b17e24f122a82f8222324183dbe02c48cedaa10c4b64d

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