Malicious PDF — malware analysis report

Static analysis result for SHA-256 238a0dff35b7797d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 17:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d511f4561fb221b1d1bf35677179ac4 SHA-1: 45c98c822c93cb894886f85a9a69232fbaa3c8ec SHA-256: 238a0dff35b7797d10829d08689e4d5c4cc3e4985ed3a8c89bd5fcd87502c4f1
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of link farms suggests an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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://jagatjyotischool.org/jagatjyotischool/userfiles/file/67378268024.pdf In PDF document text
    • https://nevisnews.com/userfiles/vabab.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ikt2494sbfc312d167mbvnmut1/sutomomawo.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/9323893551.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/69697117409.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/70860006916.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/39470191026.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/5792010030.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/265f797eca44bb7fdbc36a43a802d818/robepewuzuvatigi.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/64095278622.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/68140935748.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/niwinafibosamevoxi.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/gugikamewezuzivi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7fed4152---palerojobonanazodisixu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/folipujewuwi.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/zevesoga.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2a2a8dee---49991481649.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16306379231342144055.pdfIn PDF document text
    • https://highrise.pl/file/21249835696.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/67423873133.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/mudumaganere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=msts+free+download+for+androidPDF 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_off0000ba2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 17780 bytes
SHA-256: 7f84ef547696b7c7b4fd4e378d0baed49efbac38d10d2024a1c2108990416448
font_01_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10424 bytes
SHA-256: d004d6245481c230a74e1d60e5bf579170a8348592203ebb1779539cb1265ad2