Malicious PDF — malware analysis report

Static analysis result for SHA-256 2795d76c326b57ee…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 22:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b86f85074b4adcb1bf1fe719c251ad77 SHA-1: d1dc772fbf5d1f3cdbe020f9062860dc0d1861a4 SHA-256: 2795d76c326b57ee5640b7a03b868745a934e7feece5e533ccbb2ea455b86eff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely part of a phishing or malware distribution scheme, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161382c53529a4---83371406344.pdf In PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/xemoged.pdfIn PDF document text
    • http://etre-belle.su/images/file/75799959451.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/kevasirajotuvisajema.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/baminog.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/85107179373.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/4616985835.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c293686f---gatepokaxagiv.pdfIn PDF document text
    • http://flirdining.com/uploads/files/tonisubexibojurupul.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/gimemogub.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/19681960919.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fbec66121---85997558809.pdfIn PDF document text
    • https://attack.lt/images/files/tevudonasipi.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/wakebifaselopemuposeraj.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/62768617817.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/sosar.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lurebusalunadibeze.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vosolugonemedesikak.pdfIn PDF document text
    • https://bloc-immo.com/images/tokilenotujizokivujak.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vv9nt44mqi8tvsghuv2lftmu68/tasegoxabafegugegak.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xogogojunog.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090510182230.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/lojog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mmorpg+android+terbaikPDF 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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 17476 bytes
SHA-256: 252bb97086522796d947335738b9939e4c53cd1ab3698c7dec06c2310c9fd0de
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 10748 bytes
SHA-256: e85e7b18872413ce15dd9fea6af65b90c519c61ac93586c1d55152c14201d410

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