Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e75f52681ddd1e7…

MALICIOUS

PDF

83.7 KB Created: 2021-07-04 23:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 60da6cf4e67b9f2126a95e673cd1a593 SHA-1: 3d4b71dfbd4b518ab1a866a1149702031c7fb8de SHA-256: 1e75f52681ddd1e7ad3b491f92f5bfc3ad68c667c1cc09901e50fe133bdfc481
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URI links and a link farm structure. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=manual+civic+for+sale PDF link annotation
    • https://baobihungphu.com/media/ftp/file/40824735272.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/e69076251vdorq7j9psdja4msl/78950419285.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/1638189873.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/02a125c57d876ff35494d5530a8257c8/51544745679.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/mabun.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xebasaxurabeva.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7d7dd6b9---20695709371.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/36c97b4a8faa693f01827c8a349592d1/89267003818.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/55575620477.pdfIn PDF document text
    • https://mmszke.hu/files/file/fomikujapuxuwojusibegakip.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/63594815554.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/67561952652.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/siwewekivixanisukovetukus.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/fubik.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c585be4f6c---zijivebixijenezizebavinil.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cf6a82aa99bca3d243a292d70071e2ae/jifavetowitumarogenubaz.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/95550955581.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/lumepidokobogibajonu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1rf3pbcsvu46qqacpm6a7dt474/subezopatitenepupe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f637d0ec58---44997171139.pdfIn PDF document text
    • http://m2m2design.com/userfiles/fagadikuw.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086eeff079c7---rituz.pdfIn PDF document text
    • http://chineseclothingonline.net/File/bibizozowewabepawagowi.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/fefemoluvaxuvawog.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607556c26ca89---68805959206.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16544 bytes
SHA-256: 2b7a960ec4eba29c131066e642990413fd493079fcba00f9fc8273dc6caf37f7
font_01_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 10388 bytes
SHA-256: 0141d80ef67d41efa610a8123ba3f6006ef768af6184714e266078be4d109766

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