Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f403861ba7a787…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 17:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4e2224d074cad3c4315d6fe3ac7fe54 SHA-1: 19cc39e8e0d4de1c654e4b508964b64d6f3de391 SHA-256: 08f403861ba7a787682685bc012b42e08e3ea5186a71ea94f5437f382c80b493
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=afro+blue+real+book+pdf PDF link annotation
    • http://bayernglobal.de/userVZ//file/52791304907.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3a8b7c32a3f735b300714fa8ca303b93/4744496082.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/84766806407.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/v6vv1iloqkdnf8s1t72qbd7cva/74809697950.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160906b3503f81---11974172723.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/popada.pdfIn PDF document text
    • http://sparkpro.lv/content/file/rekejemiwitup.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-27/20210727232903391020.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/96269788802.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vulapijiwegobuwuwoxavux.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/91269596514.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/27473774545.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/jirinut.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/25401449877.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/98922790546.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/50255497015.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/403026335938eb94cf9b6134cd2d30c8/pivatelifixofikedaxe.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6542c6ec---34265445507.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/548ef7998e07e3e486e2d135bbf75619/731591914.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/lupuzakemijiko.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae156ce88bb---mijonoviw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ck9eh35k54il4qr357vqf2oh1/5684851487.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8f90286bb---gikamuxipubewosixefano.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c1de45138edca3197a3a4bcc786e1c4e/20916098548.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50b23dabf---labuvozosofewalin.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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 18448 bytes
SHA-256: e0104277a122af9018deb8c856a0a24c93aecad3ddfa7789c957717e242e94e5
font_02_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 10344 bytes
SHA-256: 65ae5e8905c7158b930b5ad7a6727027d530b268c1e946e9a3ab820927c422c9