Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b133318621bb84f…

MALICIOUS

PDF

82.1 KB Created: 2021-06-19 04:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ebc70d22a0a37cc8507dc43c3fd061f SHA-1: dc820adbd98fd53bf05d59c1a81113faaf3d5905 SHA-256: 5b133318621bb84f377a546223c68052392ef6795e86e0f24323e43de4f6a24f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, disguised as a free download for game DLC. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=nfs+rivals+dlc+pack+free+download
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vp75ka4f07si27fihs5iqrmo53/35823272627.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/6efb450d165e1f8a87ee10bc45953515/86605816349.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/mu6e31aogk4cqb3fgss9ptnt7s/katujujibupik.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f464172b1d9a45f0822ebeb33cf772b0/woxufumunufiziwonatovipaz.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/08421743a210bc54dd7727ec000e3384/zafunikuzawanu.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b4f88ce3ff4d933c0c770011bc7930d2/fubilukumafe.pdf
    • http://musorcentrum.hu/files/article/file/fonozev.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085357b62c15---jetozufakigu.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qk4i7d2ink97ofmvisl1gtg4e1/natowijo.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982646336cc---paxonurezipatelarex.pdf
    • http://deltastal.ru/userfiles/file/2563656369.pdf
    • http://donauwell.at/userfiles/file/nazafupovuludamemokixu.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2f7257e72e2ed8ba1d8d59ea8266b0da/bikesalogufogug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f3.bin
4df29fb801d59623c24d1d0c21a1692c99a4be108ed5a40b37f1679e2504ebd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 5044 bytes
font_01_sfnt_off0000ea29.bin
02e0d82343da1fc833ff26df1ef74ec596fa765897e2cb45c29205fe3e759bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 6392 bytes
font_02_sfnt_off0000f978.bin
8e4fdb75205901de7ef69e71cab4e5a435e86146101de7a17d3f2e7f5525d273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 20872 bytes
font_03_sfnt_off00012ad0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD0 4324 bytes

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