Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d7181aa418393f…

MALICIOUS

PDF

154.4 KB Created: 2021-09-05 03:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73f0396ee12b2f0a86157912e1f1dc54 SHA-1: d55f0a3312d75dccd117c9d6fe2c2dfc158c803f SHA-256: 52d7181aa418393fe72013e584a2086ffa16d0773bdd320395abe11ae04f6bcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for malicious purposes. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://taketty.xyz/js/ckfinder/userfiles/files/71505223204.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d09c8c25b0f87bb388f8fae5efd43ebd/zatem.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/selewiluv.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093330bce6e3---xewugedomazeviralira.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/46364413023.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71325cd4c---pedumaped.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/volejisuxa.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/mavubekapudijafaki.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/bujixozikuvox.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/15253014941.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/56392838941.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nufununolixenez.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b4b09f78fc500ccf7da605d90e13870/73605112349.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/q34h5c8n4fb8um99ic6qn61kak/46844271082.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/7103774378.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/64387372988.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021081408035433.pdfIn PDF document text
    • http://museeducuir.org/upload/files/batobobifasipol.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/xuwugiw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5f505c0feaed58c3c5e602863f3f3d7a/mixovoxebejirujisewug.pdfIn PDF document text
    • http://chromavials.com/d/files/magenaxujilonisisokawogut.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jidafov.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4f7fec954f032195abca0edc8c6c6848/xelinikujejunikipopotesi.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/39469365237.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/retuxenit.pdfIn PDF document text
    • http://uci.ir/userfiles/file/fetomasodijeji.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/24576077153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=nanda+pdf+2015+gratisPDF 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_off0001efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFD4 22700 bytes
SHA-256: 5fa295d6694c0789c053b9dde40bcd2a7ffc16bf16e8a9a89344e6fb95b1ec72
font_01_sfnt_off00022acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000242e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242E4 10780 bytes
SHA-256: f16274878a04a8fa6f4aeb08eea0563633e6b8de9e0046c6858be8b17a675dbc

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