Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a075a86d4dbed1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 12:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2917c6b7e20046721de9eb08638db454 SHA-1: 61518b6c8149ef5a16f2a21d538bf9f620589ced SHA-256: a5a075a86d4dbed1bca0d3ffdb13561ce3cb382aac8ba5d2b9fee391d45984b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/26659340856.pdf In PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/29667723086.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/54988457558.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/47094038974.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e309919fbdd---kobexogumegomakexukuwelev.pdfIn PDF document text
    • http://sunway.me/uploads/file/260636244186.pdfIn PDF document text
    • http://biosite.ru/images/news/file/89865756870.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/fabudirenujijesewosana.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nafozanijomo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071814220356.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/mobowawojakoda.pdfIn PDF document text
    • https://umartravel.com/files/82128086561.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/13736937d51ace419d7f8894f69f41b7/nevusojexa.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087784a3a921---fiwikevegitorodofulax.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/51808818245.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1bea6454---81583240334.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac277771e9b---fusapawotufenilavafininot.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/67a51a995e624ee922eb6a4cddeee937/lomumotekuf.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/wanibuwekawoz.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7e97b5b7---61031425066.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079337b057ae---wuzuponomuwefuduzavomaduj.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/11729723272.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/biludomotuzekuparubirin.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7ec62eca6c1646844e951bbb6cce7cb5/gubefetazipowimi.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/7715287541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=good+health+is+above+wealthPDF 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_off0000b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 10472 bytes
SHA-256: f584ef84627dbd8debe611fcaaad347a0de8f12b4165dc5fa29cca59ed039382
font_02_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 16892 bytes
SHA-256: ce1ae2be585f04d06a75e03c149be0c33b46601bcb710001806cd90d68c68749

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