Malicious PDF — malware analysis report

Static analysis result for SHA-256 455e6484d645204a…

MALICIOUS

PDF

130.4 KB Created: 2021-07-28 07:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f5b4e191f2b19e494ec7614e0e214a9 SHA-1: 4566279efa47837d333dfe4d9f9f7db2714a41b0 SHA-256: 455e6484d645204a1e01a81b23cb8717d599f94b5dc4c6f486d537a0b879ef8d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload locations, and employs a social engineering lure to trick users into installing browser extensions or updates. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747cb888eba---kinofemojokilijagaruxul.pdf In PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/04ek524ignbb7ppt8etpqekit9/matemigepipalenesas.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/55591978415.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/rilazujoxemegelez.pdfIn PDF document text
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/xetipofej.pdfIn PDF document text
    • http://benly-carson.com/product/files/87195884557.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf528990d---fuwaxupoboxolumura.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/dea964d090a5adb7329f18dc2a7d1c98/pipozefozodedadadewo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df19f5768db---pajeli.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b38b383fdb85fc413361b600ed9753bf/43310066406.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/5434831794.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/63be29cef7708e134b7d5fef1a147eeb/tusajajufebisorufuf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c272f7a497f---figaxemasaxizowojigas.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d86344da8ae688621411de3fd72c1564/8176244772.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/tutawasogexisafe.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d6136f0d22f7713fbfd654b1d2118a84/36198070937.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9923c529---vuxulirofetifuxagome.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dda9cdb677291d2fa8803067c5d2b718/sofuxubexidawatizinu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81cb65816c---78008178426.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d39d9cfae---kidezifalik.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/tigixegojumomused.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c297ea0d1---woreguzisewe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dcc6861dc---webivepopakexiduwulap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=malayalam+movie+english+subtitlesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001c47a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C47A 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off000157be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BE 29516 bytes
SHA-256: 94f1468fc465af578f6909ffda18ca13a3c79d31062f88abcdb074d96dd9e91e
font_01_sfnt_off0001a187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A187 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_02_sfnt_off0001ab87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB87 10868 bytes
SHA-256: aaa1b15c9accadba5e8705cee0d82a08b2019e01ecfd91807b561da9d26c12ca
font_04_sfnt_off0001e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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