Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fc60f21fb3fb7f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 00:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18069cc3d6d7a833fc992684e851b77e SHA-1: 8bc06725931f9dc8b2e444a919b0a7ad914920f4 SHA-256: e0fc60f21fb3fb7f2d6c493ed2a304de94b840cac091237caa062d0250af82c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. While no scripts were extracted, the presence of numerous links to potentially malicious content suggests an intent to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e9003e657---90674351525.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4b35555b7---3262084176.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/59390996865.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/430e3dca63353540cfa41f91cced4f15/63206469768.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9qj6oj25fgbn6d6cgd3lcllsv/tozifepuxaxuxamumagebozas.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/74686432642.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wizizijemiremalobojeresip.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/53506992663.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b808e0ad---degopagonofesin.pdfIn PDF document text
    • https://network-italia.it/file/57580260294.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133813b69ff8---jedibobekukiva.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/75ekpcdoue1a96t9ak382560k0/xaxowud.pdfIn PDF document text
    • http://oris-am.com/editor_up/sasazedakufi.pdfIn PDF document text
    • http://dhf-china.com/d/files/14923290226.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533c6c47dc---19662888505.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/31508928899.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/joxamafakezobavimuk.pdfIn PDF document text
    • http://maihome.hu/admin1/file/83932802013.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/83670205868.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96165efc7e---53148285967.pdfIn PDF document text
    • https://pmms-online.com/assets/file/12436204093.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/daxesikurovodavig.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210714080706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gateway+second+edition+b2+teacher%27s+book+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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 21544 bytes
SHA-256: 150b4b5df3bb5b456320a76e65536dbcd6f66fe54910c550b4aa354bce7244d2
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 11296 bytes
SHA-256: e328acff8a09aa21cd3237c89c934760d62780f74d7d11f521502c17bdc4ddf5
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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