Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dd8d97059835a7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 00:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e2ecd573f87cca957f5786488948a3b0 SHA-1: 1fa3d3b0fcceb386031d7b2b0440480be89a80ac SHA-256: 52dd8d97059835a7cc312742cba853e95871c7c095f9d515970d11255bbfc0f5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised WordPress uploads, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://togclick.com/media/userFckfiles/file/77019015037.pdf In PDF document text
    • http://j1medical.com/uploaded/file/xibowanofoxada.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1f35c0c6---mepozawuzunovadapaxanimik.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202196347503663.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/76783926660.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59eda3c5b---17208124565.pdfIn PDF document text
    • http://skncn.com/u/files/14441609556.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/ruleworubupep.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12d5c6bcb---10825169385.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/subifisenamagakebexipud.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210904044920.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/mafidijalo.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/rirojumedaresekufo.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613FCCDB7044A.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/66909183527.pdfIn PDF document text
    • http://vipdiler.ru/files/file/nerolibajuzi.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_8E683363EB06E026.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/ropizo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd91be0317---11685657374.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d119f58def---xulefufotusafa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1to34q1fafgra9a73dsic5vg81/19312292170.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/44040780172.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/35280726977.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210914150420.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kewowaxexubiropuka.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/55600669991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+random+ringtonePDF 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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10356 bytes
SHA-256: facd6e101b3558e720c931b555528e211cb6154231de3bb5401276671549fb1a
font_02_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 17316 bytes
SHA-256: 78e505c95ccf0deedff5d68a4d7b7c9bee2eced636ff8f55170cbc11ef8a5990

Open this report in the interactive analyzer, or submit your own file for analysis.