Malicious PDF — malware analysis report

Static analysis result for SHA-256 c061040f06d7324c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 22:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21a8c05b05084541bc66f9aa7d380498 SHA-1: 6a7cdc4fa8a53b798c04afda95b5b129b7d3cbf6 SHA-256: c061040f06d7324c7b5bb377a40517f712a4166c0c4f07fb74bbfe5417746235
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely serves to facilitate the redirection or exploit vulnerabilities, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://interstroy96.ru/uploads/files/wuzavufiwefugesubes.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b8d09d20732a8502d83015340a27d50d/zulatepepif.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/xedugorof.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/pobelifuxo.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/20201924662.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dd22d7a9a---55376242388.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/98142962435.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/26460437667.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/97122295772.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nafapilupivo.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/lulinevapusebosisiwimepo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8fd2846b97a4472817ee71d87e0acc30/55819048412.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vimonaruzuwef.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/14bd161ddbc4c8cf6448e11459d17fb3/jibawejutufojanazumajigen.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d0d29ccb---witojerobuv.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/bonabuwuzawoludin.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/58545646893.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b9e0ba6f47084aeff2fdd0eeb3e1945d/5576484446.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/59150030425.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913828595155.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/kifisaruruzopadab.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xixaxisalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=intelligent+investor+book+in+tamil+pdfPDF 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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 11092 bytes
SHA-256: c3bceaee750bdce7063edd44cbedc1f35c93d8469187329e8b45a4ce10e4ba37
font_02_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 17952 bytes
SHA-256: 44275df184edc71cbe1664fbee593247b4e93f367b5131cf42c3bd6583bdebf6

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