Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ece70fe85f8580b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 02:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 892640f186967f3dda46f071ed1050ed SHA-1: 964121c7e3a8ee31e717c809d4ffd2976fce2fd6 SHA-256: 4ece70fe85f8580bac14e4cfc0871fd1f42a70eb7d7312d645dd23074bbf638f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=dictionary+of+synonyms+and+antonyms+by+b+b+sinha+pdf PDF link annotation
    • https://beautydiction.com/ckfinder/userfiles/files/15746916555.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/18584983140.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610395477d5b8---rupizajujiduwa.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/98826171680.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/mogapiwixobigej.pdfIn PDF document text
    • https://5udua.com/contents//files/49571579207.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/vewekipapinizuk.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1d619e0c8c3be0253e7443f8d9adc3b2/dodomuduzugoran.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/72675844820.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/30359303646.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/79126612682.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b89978d4---3984599155.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ab20vi89737gpdm524jfoikdme/kenuzunegarufesogo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4802d2b6f---45461014405.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/tisumajazupizibi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6481aa430---12391532238.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/vafakasujonimuxatagumumax.pdfIn PDF document text
    • http://glassick.com/userfiles/file/96860833587.pdfIn PDF document text
    • https://aneri12.cz/res/file/gawamemofixafedur.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9cf900d5---totemodekugug.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/59524641679.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/mupuxogenaxemab.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/21359420226.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/95807036297.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dc18b29cdca---famuzavos.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f3c9bf53ca8b12f5678539a604054f3d/95202307884.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_off0000c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 10964 bytes
SHA-256: a3a4402ecf22d78c549ba77cfb8239b0be0990c319d319c8ec734f7e7fe1334f
font_01_sfnt_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 18204 bytes
SHA-256: da026bf486fef6dd4f313eeb112888db2ff198eae713b4fef495461a51189c48
font_02_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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