Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb50e25cfd53f65…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 02:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be0f5fd8d549db53eb121e76e3ac6f4f SHA-1: 66d3432aaad303af1157bfc2e933b4176b2f0278 SHA-256: 7bb50e25cfd53f656fd2a0ba7734bc1adacb8f2204785ef5473dbedf35773b61
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5ah8e447ivspsjj0gvtq7o94uo/48466422308.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///76375215166.pdfIn PDF document text
    • http://htwy.com/upload/file/68906543815.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gidagiwoduxinupakeja.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/61816172612.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xugetelonofezawixe.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/40152881582.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/visedukadekuxosowix.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160799fffe7f8d---57340994955.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612115bcbd461---tuzaj.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e11c78a76638bfd055918c943de2e7ca/6982248633.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d69e27c9c---47023268479.pdfIn PDF document text
    • http://esistore.com/userfiles/file/kunixamegene.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/89f95304b37d0f48e819380439b5ef24/nupijoxivosurunowanexaz.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/69160608929.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/79408327219.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/66248735247.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e2420ef3---52007860122.pdfIn PDF document text
    • https://tisuputih.com/contents//files/64111197023.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/74d1fc2ff0eca48a79d49eae28298be1/51453756172.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410c78a319---60454198801.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92866060081.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/vibazowaditewubiris.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807efa49f20---40943650258.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0aef07a449b7b992c9668f67c8dbed8e/dewudibokotekasuwufere.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164f06a95f---45712378465.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=burn+for+me+ilona+andrews+pdf+downloadPDF 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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 17628 bytes
SHA-256: da60232593e4e7eb39cfd6e453c73409f3cadbd775504780bec175b1b9fc9830
font_01_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 10800 bytes
SHA-256: bdee3831c92a65c61818dd5665e3158d64a7e39828e9825399d81df00ece7d42
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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