Malicious PDF — malware analysis report

Static analysis result for SHA-256 1542741b3f797fb2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 11:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f841b6bff416b1cef2a252acc8e2c462 SHA-1: 9e2f703ecd82aa564202ed90968efa49cb61088c SHA-256: 1542741b3f797fb2cd22b02a7fd72bee6c0577bd59b324ff0cc7c9ffe47ea7e8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the presence of numerous suspicious URLs suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://msnladyboy.com/ckfinder/userfiles/files/53275471229.pdf In PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/d93deb77b7ce5acb19cc327c16e78f75/widisodulotapisebavim.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/318296277ad633945d000d513209edeb/28897229399.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0d7f006f---nodaroperot.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1f5301a32d54c402c22e61ffbc35e903/salenipokakofefilap.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/75055167465.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/85295551617.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/xukexirujesu.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/lepevekowovi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf61216a2a2---tefuketedaweparere.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/jubinovikaxifojitexuse.pdfIn PDF document text
    • http://kite-surf.sk/files/gilelenulasuzemuzuz.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160858351198ae---wexokalubesovumute.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/hg2bq1ug1eeikbj73leraadbb9/72002280947.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210830_1087CCE91B9C8A09.pdfIn PDF document text
    • https://haidangpc.com/contents/files/pasakolebememat.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/witoxovubolativan.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/figej.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0t6ieja60kf672p3dtam7jugh4/16156243057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mathematical+finance+m.+j.+alhabeeb+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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 18716 bytes
SHA-256: c11c7d25d575a3a4c872a68f89b537df282db39aa2f374be2459382fb3d4c440
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 10828 bytes
SHA-256: a9e8cae3f6afeccc75587df540b1370ad3bd8bd02c69e1df64b7224522d6c948