Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c512b16a22bf92…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 08:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd2856452b3ce826f846e8afbd1fd117 SHA-1: 1da01e58fa3b41b323bf2a0f3bbe448b43cff0b8 SHA-256: 07c512b16a22bf920f3623a8ed9949f431b6fee09d2b84f5c23890aa7157afd4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e875f20418---tosovugulevikazon.pdf In PDF document text
    • http://www.sudaff.com/pics/file/99401764531.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ixolugaxisuxa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f0d1dcbb---515470246.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/njnf8d0tlknirs4m5ht9av56nj/46659063847.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608098f5bd903---58907495664.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/satawuxuperiduwanenera.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c4813883de053350e49b34411d9b4bb9/14481945768.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/87108794563.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/maduwonezeron.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c15on6map5sc8bo2a1ss44nba3/60297799961.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/369fe842844852d24ff40aed38902a86/60235502877.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/90292288599.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/35818f8551536c17bf929ddf6560d8b0/28673949294.pdfIn PDF document text
    • http://jngf.cn/files/file/penelubulijawapovemorom.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/dogadizodu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aaf8c3483---nagewisurexo.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/83703070324.pdfIn PDF document text
    • http://charivne.info/images/file/64828376063.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f5888551---55439236360.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0750977001620184993.pdfIn PDF document text
    • http://camwater.org/media/files/16045343077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sql+server+transactional+replication+best+practicesPDF 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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 17136 bytes
SHA-256: a4989eff769c907fbb5676e474bec1fc7a6d5e85aefe47c642c8929ed75fd323
font_02_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 10792 bytes
SHA-256: 471fc1e720757a7fd74316e03d28c01027c9d9073c0b6ed8d7f9208c21d524c9

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