Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e69051561f74fc0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fd8cee6539e552efbebca93067a4130 SHA-1: fb33e0635a074441f32be01e1805fe78515caf5e SHA-256: 1e69051561f74fc0a5637d72a93679806e5dc2cb2cea9d2a0cd50d93d498f69a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or phishing lures, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The presence of external URIs and the structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=legitimate+essay+writing+service PDF link annotation
    • http://tns-china.cn/editor_upload_image/file/28632931141.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/61466489370.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/xowar.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/noximezerob.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/7331431919.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/tevidubatero.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/bafedikalijadilipas.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/kirag.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/74814957912.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/13399448123.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d4881b47---dibipakowagukimevenitaw.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/jixajirop.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb251eeb44---74265489190.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/kulerevagasexugenipek.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/54824717272.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/futewaligininuvanopimafe.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/boxoxojuduka.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfbf6d283---domolujekipav.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/54497453642.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/64712258690.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/60833142104.pdfIn PDF document text
    • https://labelmarket.pl/data/file/gonuberevazoten.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/54722962310.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/sajibarizakalojizexose.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/jakupasoxobabibat.pdfIn PDF document text
    • 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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 10632 bytes
SHA-256: c811a5582a0349c956634b1c5bf21590e789ebda79c652947ea8b9a014d83a6c
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 16688 bytes
SHA-256: 1d170ba8e276d4a77295bc1df3cb0cc9882cd81d705938e921f70d5f3bbfeaae

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