Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdeb5aebe0a91ff…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 02:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 129bf5f9bf8cb911cce37b125a23db84 SHA-1: 15753ea858db2e93073dd08d7af7e3e05a7c8183 SHA-256: ffdeb5aebe0a91ffb597dc29387bb271bbeb68fbdfacc0036dabb3da8ea19ac5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous heuristic firings related to external URL links and compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of many links to potentially malicious PDFs and compromised WordPress sites points towards a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=word+formation+pdf+list PDF link annotation
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/2402641716.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c6dd7031---72343358244.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ruworoluwebalujeg.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/kelotidufozawalipegigevep.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4c9a9e261bb464f6f73a68c6e2e85dfa/92500390524.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/85032167732.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/pokoxufazadenokemanufasu.pdfIn PDF document text
    • http://chinalabware.ru/d/files/lulamezuwilitisidadid.pdfIn PDF document text
    • http://demkapi.com/resimler/files/riduzamevobebisuxol.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610245e7c0e32---kivowu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/17980200276.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/30ac3e28db77bc79a30ac8f5d317dc3d/23771700937.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/lixit.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/116e3c893f88d8157efc5a21087b4c84/mofovotoguj.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/lofiramezulivagenelivux.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/76703090083.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/nozugudifetazopifakudepi.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/derekogajun.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/vidor.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronazasemuni.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/12491728156.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/54106655142.pdfIn PDF document text
    • http://clingac.es/d/files/9500849117.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/lamafu.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/46215276936.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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 10520 bytes
SHA-256: 29139f65dd94e39ee89da9951f97aa430a41d7f4864a0cfa0e9f2d5fb125a7d4
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 17880 bytes
SHA-256: 7400a0ae149b586ab6efac328d0533006b5a8dc1ae0f7a3032eae87ea54c37b7
font_02_sfnt_off000127cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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