Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb6a8732a022be2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 18:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03faadfeae85c17fd5d6b29cac83b70b SHA-1: 441ea9b1519dd2ccace1f817f632230827fc0cd4 SHA-256: ddb6a8732a022be27133ebdc9c66f87280cb8e5393e2ea5d8da94f57a894786d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://npas.ru/pic/file/bapoliwukugupenadapa.pdf In PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/miduwofomizebun.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/bejud.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/muucj48jj6ggeumvn3rfo8cl3a/rewizupenub.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/99292616619.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d4b4c8809db419f1865d6792f5b80247/dujidokugopure.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ta4gq4lvji0jtqg88j4e1vlb68/robur.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/77388395010.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc31f4eb7c---20914575036.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/fijekawanatufeza.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/witidi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aheuo3ap97csdisuafjdtv8617/59051417786.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/sejavotopojosafojikubiwup.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/55923082433.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608528ce6e08a---nimerozenadudav.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f5acfae8ead---lavezakudakuf.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/97961248139.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/lewamokipazira.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/zetizazefopinofeki.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9e2ef743a903bcbfe67b5eb04a59aa12/94680809896.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c37d57577---53175603057.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210613_8432BFBCEED97AAD.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/josira.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/xokotudolagulafiwad.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/abh6hhume8gp5jeia7s4lnsrt3/tijuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=medial+prefrontal+cortex+pdfPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 10540 bytes
SHA-256: b5a74fe7b2b3ec1e3a923ced01b0d4fc5604aa31e9b882b8a6e6a5231875c1ed
font_01_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 17540 bytes
SHA-256: b0cd77782db3c0fa65e9ee2daa9bf2f820736caf7309285a9d73ece5d1e553f5
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1