Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc38bae3800bff3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 04:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6bcafc4558b4897141e02c37dfaf67b SHA-1: 25228e0a028ecbaff1c48daee667571d64c57cf1 SHA-256: fbc38bae3800bff35c9e6930865b19190e0412351204cf2442ad8e354a2f4200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=passive+present+tense+exercises+pdf PDF link annotation
    • http://amblesidewindermere.ca/fckuploads/images/file/tigudatapulabitorekis.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/14bd1ec6723a18a74fd740774e668a04/28487899022.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210612_175446.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3592d0374fe41964f272a3199c66c0e6/vanazibakuwaxowabivigol.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/31ec2f176f5414fc8a30810601f9980e/fedupefa.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/pusoserekulikadinar.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/9355741178.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c13048a49---pevamepofopobi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5e22de87---fadojodale.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/29099138512.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/soveref.pdfIn PDF document text
    • http://arslanemlak.come/file/93022055625.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://tryinvest.eu/userfiles/files/nexatemilim.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/monebiges.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/98503145250.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/tejadig.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9e6kvgr9hffmm5ntsurs611bh5/jewilasewepu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1efc8c5f9---23604936632.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/megalujexejato.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/62775666423.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/bezepemineti.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c69e24cb3d7156b0dc2900a94aec6bf6/tofipowefeti.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10616 bytes
SHA-256: f59537cfdddf6d04a673dca6c005ad0ee49db99345657afb10414b624d7a10dc
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 17968 bytes
SHA-256: 54b3d676f52bb08d1564f27c59eeb6edd4bbb8e55e2b67ddd6f97b65ae70d429

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