Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5443d0c0a7b8f3d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 16:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd9d2debcd19ffb5cbf96fc615787c0c SHA-1: 87b584832754cf4d31bc3c5a515d23a92bed0fa6 SHA-256: d5443d0c0a7b8f3d783455977455e23d9a428226d165ddcd893617f7e0272a62
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://naturenhuman.com/app/webroot/userfiles/file/zixomesut.pdf In PDF document text
    • http://didopack.com/files/xidebetesaw.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fa194a97cc6c7797c1ae855bd7c1f9b3/xibejosutinolexizilojape.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/14224454350.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/sokaminivibalad.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/iqnojbhtb56ajvu68rgktfglbb/sosowave.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5d6sqg7icjqgv5mclf9pham67g/49721095749.pdfIn PDF document text
    • http://aweibel.com/Photo/file/jorujoraguda.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/60525159766.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/menanuxelubefakaxepojag.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/jupoboxitub.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f2e687ed---zigisag.pdfIn PDF document text
    • http://asustainable.com/global/file/fowowavovijepunudo.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/1504820729.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9becd7ce---5336162617.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/43230796726.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/19969987660.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/bemuvura.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16105ce2b75469---datidaraxezanube.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d970045e---69468991285.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/latemogiguroxad.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nidabenoxofewawufak.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7b4ejrg0l3ods1ogeljj3ugkm5/35762833927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lineare+gleichungssysteme+textaufgaben+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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 11360 bytes
SHA-256: 39974210afb3964885cda11399db704330c361ee18042a6e3e001083ccdb9782
font_01_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 19672 bytes
SHA-256: 54995cacfde56c9857bf3451b928a5b075f2baeaa6373feb69f2d55b73f7bbbc
font_02_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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