Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5dd3870d4e2e2a4…

MALICIOUS

PDF

91.0 KB Created: 2021-08-13 17:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1e9e986f6bdd8ee469b426106bc7f615 SHA-1: 089f4d88062f8c29e0b344f00607aaaad1c70923 SHA-256: e5dd3870d4e2e2a4b0168dd14d4d75dd2b4c52fd29b271a769dd1f084aeca528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to external, potentially malicious content, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=asus+router+rt-ac68u+firmware PDF link annotation
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/66119799674.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/088caea180f0751c0d9b0c7156d4f4bd/6738609742.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/6343e2aeed807e7c299b97b71f180144/966884976.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703679ebef7---lerezu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4cc64ec4d07bc0c17d0ba0ac5112fc2b/82266413990.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/10368228191.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/8038528064.pdfIn PDF document text
    • http://slsnn.ru/content/files/99115903579.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b30a0e5fb9502ab42ea892ea0464702d/rewizowomu.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/68248465989.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f962f1a53f030fffbc8c9ca118009c2c/zawejezuluveni.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bcd5f21e1a712e946bc0464dc01ce8f2/80535772268.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/16919308893.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/zotajebunifubemiv.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096463e6b26e---94210629718.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/funomotubajapoguba.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/aadlf64v2jo5jjekc9a0ua019r/xudokumanobadaxedat.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/93f4p2rvn6v0cunejqqgbc622a/razubimot.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/34715291676.pdfIn PDF document text
    • http://tano-cable.com/d/files/vogiwijafetutorija.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2af471b8---sajomimosini.pdfIn PDF document text
    • http://goref.ru/files/file/telomesewi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d5f294cfd3f71e3143445f1d71abcbe5/70770762574.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_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10924 bytes
SHA-256: f2014b5dff16d500901fe46cdf2a69d26a185ef5d53d0cacc1ca1490321605c2
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 17568 bytes
SHA-256: 159ebdb55e041281985a5f7d98d97dbc3ded93542fb4be119843801a98b741c8

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