Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e15e30106759cc8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-16 10:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e0c5918eb42fae0650ed48e5d2c8269 SHA-1: 1b7fa1f6a27ac8943142af3ac76b8b268abb37d1 SHA-256: 6e15e30106759cc8826582b824ec9a5fa915c4e3e861c63bd2954b0b17026f2a
96 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple websites, some of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent, likely to distribute malware or phish users. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vit-physio.de/file/40640399470.pdf In PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/98600154843.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotosafaropijosuwas.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8e6bad439---98984387133.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/veridolitizodimivibefe.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/kadiwaratemukopoxabig.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/32419252446.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/jazilinujawujemeg.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/h1spbfuisuekf1i55q1bjm9cqr/3557379300.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/repolowinobomoko.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/rodifubijorifizuwidumejob.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/66307498347.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/ganivetolobotavirukonorel.pdfIn PDF document text
    • http://freestyler.cz/img/file/57885415970.pdfIn PDF document text
    • http://metallpress.ru/files/58919336755.pdfIn PDF document text
    • https://icbacademy.com/upload/files/megufaku.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f456c68db3---budoditegoxuniwemesulos.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/ronirokiwawonapoke.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdeaca655c---65829344627.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/zetuz.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/fatoka.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7ebee230---dimaxakomebujorigoxagobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=my+hero+academia+season+3+episode+3+english+subPDF 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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 11380 bytes
SHA-256: a7301e164fba32c15d2a63e8b9b70c5742be2818067a93f09c324f562b207628
font_01_sfnt_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 14948 bytes
SHA-256: e9986b706d6e8a7f3b562c90d09df3125ed1b9d107ab5874fccf27d8571d76fb