Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6a8e4edced25c1…

MALICIOUS

PDF

93.4 KB Created: 2021-09-08 01:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9dfe12fc92fcd2d949653cf3a019434 SHA-1: ff7287821aaf5d274bcb09bd972557ff1b03d3ae SHA-256: 9f6a8e4edced25c1b5913f03aab07b5f803aedb8812a5b6c4132f84f04fca491
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. This suggests the PDF is used to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asdgolfclubtoscana.com/writable/public/userfiles/file/10416028004.pdf In PDF document text
    • http://fw-simple.com/uploads/files/vatogopud.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/86d727c65fc088dc7cf2603e884b2b7d/wetiposenesajivovefo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a234a787---73308123699.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c337d521---72812163810.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///mibasagakoxatol.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nisunudizuda.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7osv2t6i82hi1360q5em66ee89/tamasoratetew.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/44a51d7f844ea1842e6d5bdb0bef3da3/reridawi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/p66g5vd0sdea3t14kk9au6nfgt/kenivitulatesiwegosa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cd454m425l8k13gblsof2u04g1/62993176432.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/tagevurowofivibo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4a69b5cda4c9f055db74eecfc5088402/90971781263.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c60f2c3a82d---negulerebalugoroderul.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/31926716376.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3381cd812---23151553240.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d576880d59bf3af5a2e648fcd0cf203d/39179997366.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160985cbf73f7a---talupiwupipozubisivuse.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b42b89eb8e1d91c830c72f8e599c51b/fabazumopijipux.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/mopelureme.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/83732992938.pdfIn PDF document text
    • https://upaspor.com/resimler/files/mugamodit.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/janufekanikopisupidunifaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=control-m+workload+automation+manualPDF 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_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 18080 bytes
SHA-256: 59103f627ec20f96056fb281ebfbe1dc273de85535a8e12abe9db8d6f169df98
font_01_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 10452 bytes
SHA-256: d8ea9d76301d733a2b3daf8266a574c32b10aab0f5d2610a6baa455a7b5ffb15
font_02_sfnt_off00015059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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