Malicious PDF — malware analysis report

Static analysis result for SHA-256 7609364e38ec3d38…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 06:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5b6c5f8f4e1e2ac3ac5ac236114d290 SHA-1: 350279a834be98cdcf0470efa6eaa4b4918f43cf SHA-256: 7609364e38ec3d388e168411286b51ee423b21b08efd7b9a5e5bcad451282ff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kartywspomnien.pl/uploads/assets/file/solorav.pdf In PDF document text
    • http://studionegro.net/userfiles/files/78247655388.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/3798841253.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c54071b0b85001ca97fce1bb986f84bb/xabitegenewowukakitutovu.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/57867335676.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/3ar2kgt73qudiukdu3tqgbv9ij/66662123649.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xonogejonal.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/39275711520.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lorukafevugemovezenexowuv.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/72194741160.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/mawipuvamowuzimo.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/vejepojife.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/21417068445.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d3f06c31---volirugavesesunijok.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vlhhf7d0r90t9o2fbdv9j5bsb0/99432614061.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/19224060834.pdfIn PDF document text
    • http://agenziadiviaggiocagliari.it/file/konividozavokinetat.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/938420bf55b1c81de7505091e3ec792a/39443436700.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/42548760053.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/mimifosomebifutexobipuf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1c86423m6b635ct71jf450ak37/45955179108.pdfIn PDF document text
    • https://medpressa.ru/files/file/velilofopofamiwe.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/rowumobegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=writing+equation+of+a+line+from+two+points+worksheetPDF 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_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 16592 bytes
SHA-256: 1f3de8e7f699fab041ba136867627b836a626f4e2b4dc9293382bd0210ec2ac5
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 11220 bytes
SHA-256: 38e2097ef4e5285500782390ffbf794771a504cf42d7f821a32112c780a1cabb

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