Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e47319ac697bf9…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 08:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dd9d359e07e06897723eb569faa8428 SHA-1: a8646de8295db74404035c102206983401c0bf09 SHA-256: a6e47319ac697bf9917d3e49c2cc07ca7aa72df393e023c15289dc3f99a6bf1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a distribution point for phishing content or further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://milsagliksen.org/upload/ckfinder/files/fisolazujefagapomuwil.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ju364e7j5uutsu8ekeec5aaaf1/jiwejagemekumiworudusupaz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/cl23b6kq7785pmhtdotbe4l091/91196555022.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/vopisalolafawifuvobifa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/742684f35d98c8beae6d389f2a3eab79/kodakopoguwula.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/zuwelotaril.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7533118d9---kodikotasal.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/betasaxelumuzezex.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/nuluf.pdfIn PDF document text
    • http://asustainable.com/global/file/pevaxizuvobefi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a8cf510ff99e0b6601dc22c9f29ea9c9/kasekaroronevefazag.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/sevuz.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/pasideziwam.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ha4loj5aj824ncdni6ao4evpjv/12323214360.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/23404155085.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/2377362438.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/31111732803.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237c1a0ac90---sejesisejonujadugukijo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f38fe0ffd75d3e3c8672c7a98f8f9945/papupenukulusijalesase.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/jeremukutulafozotofo.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/84491564372.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/viwenegofokazobar.pdfIn PDF document text
    • http://huntland.hu/upload/file/70761959596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=oxford+big+ideas+humanities+and+social+sciences+8+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 17520 bytes
SHA-256: 1c1010d3d317f6b03ba0cc376cdea077a7686f263fdfdc25f2f0f725267320a6
font_01_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 11640 bytes
SHA-256: 6d674f2168ebacced2d717722996566524f3bacd17de3c8bc4b602a60666b052

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