Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede0a431dd6bd279…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 02:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c1cac804799844ab9ca7ce3cc2de108 SHA-1: 0aefe5650181b4c0ebafe0c695459104b29fb34f SHA-256: ede0a431dd6bd2790b9eeda8ec595fef5a26c27f38dff78fa97714fe8d03245d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=pubg+lite+only+app+not+obb PDF link annotation
    • http://hitechdentalhouston.com/uploads/files/fopesokomumusi.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/mapukijeromavepib.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109081710385111.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/1554095537.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1mqfanvq5t4sdhk5nda1uqcbhk/kubajowi.pdfIn PDF document text
    • https://coevent.ru/upload/files/loviramazegewem.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332a07c60f1---91863395331.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/pojepupojidoronolevef.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/11163169703.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/bebabapuba.pdfIn PDF document text
    • http://tdbm.vn/upload/files/19107976974.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/wuligedodijow.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/zipoxalewepepakolivosur.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kesogisawikewor.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/dosibipotetepadukozu.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/tinaremufibuteb.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/8372966320.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/tidorumutebo.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ragovuputujomojuwenaf.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/43708583078.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/309b190b67e58d8330641fcb22722cca/84645868044.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/67682750234.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/57202540934.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161342fc6515c0---wekeb.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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 17596 bytes
SHA-256: 2b1b37e3b210dd0cfc4ba2a0a0d2028a0ccc3bc96741e7ddd6824cc7a55574a8
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 10512 bytes
SHA-256: ba9f4b3da214c1a00fbe41dc01023f960647258ba1519a2c3fe397eb48811ab1