Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede10b2ef4b36e2f…

MALICIOUS

PDF

92.4 KB Created: 2021-09-13 06:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dbdb93c8fce4b06259787ed2bf65484 SHA-1: 54537d77121c95e45e79021d687cc1766c94a668 SHA-256: ede10b2ef4b36e2fa5581cf08cf9571870684b25d1f0e0258e1625523f9752d6
164 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the exploitation of PDF reader vulnerabilities to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=nuclear+astrophysics+pdf PDF link annotation
    • http://ge-mak.com/files/xufunujesovimun.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/worepe.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/nojowovurim.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/walelosesaxadedo.pdfIn PDF document text
    • https://grnca.org/img/files/files/93954031130.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913055957.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/tosimipopudugazobofafux.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/78517472935.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/riduwi.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nazadapajabagazujerisivo.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/mabibu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/af9f1318b450141df22f939a90f83209/74918648151.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/pukibekadunonugawu.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/nazilusokefavuvikelaribow.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1526adda---18287671061.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kivivezujukuwizelokaxuzek.pdfIn PDF document text
    • http://chayka-svg.ru/files/31716612323.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5d6666fac4c53303420add42cbdb484a/sowesupamavuxokotofogaj.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/filafotitalabo.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/89159733280.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kosixeveraxitozu.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_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 21108 bytes
SHA-256: 25da8be942c4d6f330acffd6c5a4bfb872848db86247a403edc02773449a8257
font_02_sfnt_off000132e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 16720 bytes
SHA-256: 434da3f371c7e942552e4b4bb7f1da90fcd7d78ee1f6bd563ac14c4810074588
font_03_sfnt_off00014ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB7 10804 bytes
SHA-256: d0de1e085730e907f59f650f229b59763b9d9fbe6302e348ac007c0d7cd6cb56

Open this report in the interactive analyzer, or submit your own file for analysis.