Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcdf478b75e66ae…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 12:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72edca15514044d88993972af6fe7f70 SHA-1: 782ab715d39cca5ee2b50633e9b1ea299bd99532 SHA-256: 9dcdf478b75e66ae4137b792a400547ac463bda7b7101ef8162bcc1c1e0505aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to potentially malicious sites for further exploitation.

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1f9bdb1899be729888225b09b8e5914c/kinude.pdf In PDF document text
    • https://inwestorfinanse.pl/userfiles/file/xedajaru.pdfIn PDF document text
    • http://17njl.com/userfiles/files/72537200950.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/depuwelubarivaxosun.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7d9abd3e324340cd9573c4eda4ea0d23/gafigonozipom.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/lizenosiganud.pdfIn PDF document text
    • https://grancom.by/upload/docs/mepuwuxowavikejevifipo.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/gobebarukaso.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed90c199a8---6256609202.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/2807632651.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/luferateg.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nibevemutinupiw.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/56418574119.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210902102842625.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71768532946.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/voduxitupezobusu.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/10489140296.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/18649682467.pdfIn PDF document text
    • http://iucecb.com/files/file/wasarivuxofadutape.pdfIn PDF document text
    • http://leeandrewdavison.com/download/jamijovibabedalo.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/98668093297.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390578cd5a2---kowezuzi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/dipuxijuwisukalo.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/nibodigoleropa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=setup+chromecast+built+inPDF 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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 17780 bytes
SHA-256: cd4175e409b83ad814140c9558374bcf71d936c4cbdf4c2f2cf0955cf1e413c9
font_02_sfnt_off0001394e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394E 10956 bytes
SHA-256: 31d154c9cb77eabcfdace85171a3c8b1a199d136543d47ce3e34d197a9a5d0d3