Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61191bec8ef2519…

MALICIOUS

PDF

79.4 KB Created: 2021-08-27 10:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96257d5e878041ba4f511027ba98d4af SHA-1: b666bc574c30dd5009068c911ad413fb7ec830b9 SHA-256: c61191bec8ef2519f44b7778805b9957341e45e24747be4738d0f0d93c576af7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious or phishing content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://geo-equipe.it/userfiles/files/84579405932.pdf In PDF document text
    • https://tedvandergulik.nl/userimages/file/34593744790.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/15849231789.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1610d696fa7128---sazajewapupejidabutimuf.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/rosesozof.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/92064594862.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/13094098163.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c181da91b9---93434861393.pdfIn PDF document text
    • http://vejwun.cz/images/25957739045.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fgsv6989arl5j286qjd02nrima/tasagekuwurumo.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/vijofakivizok.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/i1k31a2k0vkaeueh54dge9qoq9/zikavalamemana.pdfIn PDF document text
    • http://amdind.com/userfiles/file/50559895916.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/lncrpjqmtfeecg4pgbmoiuep8k/19386250031.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/kimotizotozibewalaxofovi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6kdpk3717bovkcmn3aancpg2f7/xewudakubuvobonoxe.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/zizito.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/58597f4bded966e01430a710e287cb84/28176668854.pdfIn PDF document text
    • https://maisonforville.be/documents/file/16464963513.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e818dce7fc9---69047234772.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/pikekege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=terraria+dungeon+chestsPDF 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_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 10668 bytes
SHA-256: ad2138e2764cb69cf87f33a4017d83a47e555385bbb953377edadc14cecf5aa6
font_02_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 16372 bytes
SHA-256: d5a910f816d76c33652df11ca0b3d01444c9bb32cc05b65443f597baa327a8c0