Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cfb65d022b5bbf…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 15:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da370d772d7f6d635412cfd70d84649b SHA-1: 4ec41727d632969185472a922c2bdfa7975ea66b SHA-256: c6cfb65d022b5bbf98e78dd8f593fb35849ee05ee1e5d5bc916f0df1da1fce8a
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious files or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mrm5h0e69mu460sis9khdtqhfn/40839812838.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/35tci23m1lk5f1q111gemdjfu2/tudowedubik.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/87340090846.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/29592949349.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/17378435412.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/sonogebimufage.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d415b0bb3bbc9dda09dfad6bd9f135ce/50724562275.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/rewiseduv.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/futugiwiwasawosor.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7da99cf1---88056986690.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vko2l1s9389gctr0s2mhellup6/55861813407.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/77760122128.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4b3f8d6f62252cbb46d0f933c880a5fb/57706355001.pdfIn PDF document text
    • http://otczenacts.com/media/files/tufizololatebud.pdfIn PDF document text
    • https://patc.fr/imagesfile/85847526044.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/sajobajogomelelujurijuxug.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/bunudimutakavugig.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/96806735055.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/60462613572.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a234a6c284dbfef76e6db77fc4f273ec/5170807033.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/230496b5c7f5860188ca4c5340bdb355/12822668997.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/vilebugerekikuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=amoeba+sisters+video+recap+natural+selection+worksheet+answers+keyPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kidepedajosufigizu.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_off0000b890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 11356 bytes
SHA-256: 2897b99e65f7e9564bbb7362e1127c95bcc86f95666c64a3f4e14440f8582a89
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16108 bytes
SHA-256: 5d5ffe0968f64cc7f134f664eac4a4fc734b0a78b4b2e3724a72a681781a4201

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