Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8bd2606282b138…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 11:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d84d70cbf0bcbd5db998c41809dc02e1 SHA-1: e1aed6628c50b74b6e26d45f4befbacc06a952db SHA-256: 6e8bd2606282b1387265136f1667adbbf4068f81925bf895d0f281e4a9cd5715
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://synerhu.ru/uplcv?utm_term=clrs+introduction+to+algorithms+pdf PDF link annotation
    • https://wedding-photos.cz/userfiles/file/dajelipogekop.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vafiposupenixepidi.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/56916880904.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/52135074050.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/ruradesenovatojedupa.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/lolemojoji.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda330e9a4---kanorusowigezo.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/23422576617.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109080205114795.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-14/20210914145211165997.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/jofixetikadibiwalawemima.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/utse121if16t7nenm4abj6d0q1/lomoxidaxupizi.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/gejufagikomejujetajozi.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/mofamuzemidivogad.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613305f0a1cc8---9144869233.pdfIn PDF document text
    • https://parfumzone.ro/files/file/96861651667.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/pakusuwuroxalatevoretat.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lulevim.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/32580467584.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/72337939939.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/25790974690.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/77643995687.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/40372523690.pdfIn PDF document text
    • https://samowar.me/upload/file/bowuligebivijurajedaweru.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161334a924e341---vakisupemaguvefiw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 17852 bytes
SHA-256: 91d87c2d2c05cc68db53b1b70a56ed9ae30ee4fa675366d2e8d3a3bc7fc0c175
font_01_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 11064 bytes
SHA-256: 50be9874605da8fe30dc06811fc75cb02391d6236a9bd5f55428d3d6df5c887e
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 1744 bytes
SHA-256: 6d2538aa43a77a1871d8ae46d4e5682ca2a9b65231c97efcd53eabe801eed997
font_03_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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