Malicious PDF — malware analysis report

Static analysis result for SHA-256 409fede23ef9bb25…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 05:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ff25338b1cb4f668ead434175f79f77 SHA-1: a3d929ac26be56f583cfb22f4f697a9b58228596 SHA-256: 409fede23ef9bb25d59469103ffa2f904a72ea1600356eb2f4ec60733be4d750
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://learnazia.com/fck/imagesfile/17504475085.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/de1e52f8c9a9253cf32703787ba78f52/40557638613.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d1527f095---37657571765.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/birur.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3af4832b90d4b1f2718addd83687427e/sawelumev.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/55517619351.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/23113594708.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/4846732948.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161297c0d895e5---mowij.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/nefemewirobib.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/24641020415.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wuregoretujuxidasanax.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0bfb0e672---pasakaxoredibato.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/38733710665.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8e223fef93d8b793adb28462823f7baa/wujojididijufufin.pdfIn PDF document text
    • https://papiratisk.cz/soubory/tivikemupuxoxiju.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0706cdc057e9af3fad9cb15431ad3867/jidiporidibejexoxibi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61aeb0d21f---kalojuxubuvozen.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/54758897595.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/senonifebunutola.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/l4td17t5i753ebjn6b0tlqnvin/91761977728.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/20055211318.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/758350065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=quadratic+word+problems+grade+11+worksheetPDF 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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 11388 bytes
SHA-256: a17728fd23a60dbb721d17f548816e9ecf8c0f838259ce733a6854e7f834e58a
font_01_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 16504 bytes
SHA-256: 6cd9eb75c373b723d544c897519ddc9192c6a42e4ad469bcda9e8c1ce51f8113
font_02_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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