Malicious PDF — malware analysis report

Static analysis result for SHA-256 c287c6470723abca…

MALICIOUS

PDF

104.9 KB Created: 2021-06-27 17:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b83d8c4b4728ed4eee926021f17ee99c SHA-1: 4ee3f58e057cc90cfc7bed339d8d4c1855a775f2 SHA-256: c287c6470723abca4938e25d0a777a8902ffdfff04d5a6f16c18b7cf0bfaad2b
196 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for SEO poisoning and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URLs and the 'LOLBin token sequence' heuristic suggest the document is designed to redirect users to malicious content, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65d9dd4ad---degusekavewutuzel.pdf In PDF document text
    • http://www.klimavill.com//data/editorfile/fodovevapoja.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e73501ebc78166c80c22d2b2482f51b4/88237901051.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/78f249f78b489d9b0074fa9a37f193c7/sozejigober.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zezamabu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xumaxadefim.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3cnda1gq719jg84dvcmddgakbg/nizojumez.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b41cc4d1a---47377028596.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/095bf510ddd49dd27126627f237bb6f9/95076219201.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/52791b6687d831073e48571841c60619/42697453657.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863fe75ca4c---37743944734.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982b1f61dae---64020687522.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cadae04cc5a066cfa177a73bc98ffdc7/zijukajenonemade.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/totazijuwevixovilomum.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/jagidobus.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/jokumitodatulatafuxi.pdfIn PDF document text
    • http://alkanboya.com/files/file///59299727200.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f618551bd---rozatebanodiguf.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/56133173035.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/9966429458.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/pIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=adjective+meaning+in+marathiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf
font_01_sfnt_off00013305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 19324 bytes
SHA-256: 1f86120880cf40a4340fa696b21b96fd76b4c99a66ca9b3df6cb27d26140016d
font_02_sfnt_off00016453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16453 10660 bytes
SHA-256: 5143fbb07f07d64dba7c32f47142ff422cc9efd03836dfd1cd64703d821d17af
font_03_sfnt_off00017c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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