Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa843721f27526a…

MALICIOUS

PDF

88.0 KB Created: 2021-06-25 14:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa7db8e1b369358bf9471c32ff56a918 SHA-1: 4f994f41f4e03a53060d352671ca4e5a277811ec SHA-256: 5aa843721f27526a9a971b042d494f37c04f14820c063385fbb55332c5f83b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/84f0abd6949b8432a0e35e5d797467c6/17293652394.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f7529336---60827580172.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/45251468897.pdf
    • http://www.bluewhaleline.com/image/upload/File/rejugugepoxalofufimufo.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tktrncudn9r2vut090ps1oq3fm/nikazurafasedijo.pdf
    • http://emrc.ie/upload/imagecontent/file/nafedixaxox.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/tevupofebowikuji.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/8335ec9ea7eb5c7f0286f9d0f9a1eeb1/1291992422.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5ddd546a125dfee39da408747340b209/rejejikenopi.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3642a5f50---tubewoted.pdf
    • http://purofirstli.net/userfiles/file/vararufuniruvopapeti.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7c262319c4b65c5a74794f99a1ba9a06/48037916966.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9ms2a92k3i1vraf7sl19kskre0/90175837321.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/05b66bf16a29618abb72e6c8aefcb016/91272919960.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98260236cd---19282367568.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf577d93f---82196164482.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=as+well+example
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin
9b0cedd7401f222c946d97eb649290a16b8b1ad3c7727c42271fd00716c89162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 17572 bytes
font_01_sfnt_off00010f67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 16792 bytes
font_02_sfnt_off0001277e.bin
89817a8e6f22427417767c88dbf2af95e1537270bde53f6100b37e21de1fedd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 10068 bytes
font_03_sfnt_off00013e05.bin
fc96bb51e68212267b34b5acefce01e3ce1e469c7be8c0a453211fcdfa4f682a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E05 16120 bytes

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