Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9caae3c2f8888d…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 11:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e6f9391a414b76f80c8df0bffe30dbee SHA-1: 0042f1dc8ad008ba97dd273c2dcdaba0e233adea SHA-256: fa9caae3c2f8888d4b5530b1038688b9d0ab2ae26b5b4871e658e077cdca04c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The file's structure and content suggest it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=how+do+i+get+rid+of+moobs PDF link annotation
    • https://clubsportedinburgh.org/userfiles/files/90525235531.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cae1a8898378c2bc8c5d7b929f1b1947/wunidu.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072af8f46c45---zutamepopuxekira.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6872db0b3---57735391088.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12c87e1a4---12457430427.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4840f871---suvomavusowi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/34d0726c0f26400c5b6bf37342fb5b75/bilefewif.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16231723159105.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609950e44e712---sakoviguzurixakiti.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3r2tp8uf5jp1fv6e1ov35nh6b0/xutani.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bec1d20ca---wuxovovexofise.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d4a367125eec6e92895a4a7b584aa11f/xibedubokesop.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b214c4cee45---tabapetit.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd9f341c7---memaxanamenib.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160add9586bd78---93509606648.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/vigakudepubekojowajovafut.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/30745758448.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/2h0s512s5fd49ntelvbtq21cr0/powalorewunerimoj.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/79795194532.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca078c0ba5---vugedami.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/tuxilujabi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaecd8c76---xonovapujujajagomo.pdfIn PDF document text
    • 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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 17116 bytes
SHA-256: 372e1d12746386270543f86c484961ab0d0030dc03878bbf48a2e35ef3d93200
font_01_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 10600 bytes
SHA-256: 5f7f0cfbf263ed1fd1b674aecedb51a26d56d0c75faef8f75241d936633157fc

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