Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c64eef72f6d5dc4…

MALICIOUS

PDF

108.2 KB Created: 2021-08-16 09:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eebcff6bb3c3b4d46e1b698ccbe26ba7 SHA-1: 7409a75cba1c1dbfefdb1fc02919ecc92fc3bece SHA-256: 8c64eef72f6d5dc4fa3f4bc19b089a05426da7d362e40a9e2003cc4ac1b55868
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs and the PDF structure itself points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://drafthe.ru/uplcv?utm_term=descargar+un+lugar+en+silencio+2+pelicula+completa+en+espa%C3%B1ol+2020+gratis PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607759787d0a9---malejopimewugo.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/lumemifejusivawog.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210731124637_96uy4t.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/bebumazoxikovabafelawewu.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/dirorut.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/906032bf01631304b12856a68690a58d/36094894135.pdfIn PDF document text
    • http://farashimirooz.com/files/67710803061.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/52188228567.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/wobigejapimiw.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fb8f7b1ff627be6d2e66d26cf535329c/24099889296.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/0437d27ba86e97bd2459a981c05a9d34/xofebizotejusipen.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c469fac9d19---58122122923.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/32907db45b8023a3658f1f60c2cb9c08/rupufavirizudeniponazozo.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/95318422517.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/revifumumuzafekosefizase.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/94872679418.pdfIn PDF document text
    • http://citra.cl/userfiles/file/xazezikisefusinamunodan.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39d8a659e1---zexaworafux.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/lapazubemesevabotavu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160800a4179892---lipetagekejoxejomativawil.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9d9aeeb8f---30634836103.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/53231164083.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/waletoduwukiloge.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0dc1fec4---26177985168.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 20492 bytes
SHA-256: b02e47be6f501776b6d7bb25d5c9a45b438cee76baceeffa4e41c17c664ad490
font_01_sfnt_off0001560d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560D 11268 bytes
SHA-256: aa18cf7b4f169b8e9b35e7624e163698887f7e554f723609e65b5a4f94adcc59
font_02_sfnt_off0001704c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001885d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1885D 16508 bytes
SHA-256: d977fc51048ce9c30e9bd389303d78f9fafa169d28a40fb57ae15eb04a27d7d0

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