Malicious PDF — malware analysis report

Static analysis result for SHA-256 543e90e2a860f77e…

MALICIOUS

PDF

112.2 KB Created: 2021-08-03 18:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3dc392bf51e6621cb99b857cd42bd04a SHA-1: 229ae6ab8a0e740b8c7b50e74a70cf92845e743a SHA-256: 543e90e2a860f77e17697e83b0c11720f3852fdb78782b916da83c3377b567f8
204 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious phishing document, specifically designed to trick users into downloading content by presenting a fake download button and a lure for a browser update. The ML classifier strongly supports this assessment. Numerous URLs are present, many pointing to compromised WordPress sites, suggesting a distribution network for malicious files. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack aiming to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=http+injector+ehi+file+download+2019+for+mtn PDF link annotation
    • http://speaklifeiamgreatness.com/files/files/67302465306.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tebipikotugovi.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/26401235473.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/talodozasuwofim.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/75391670981.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8249c4c5---45713598599.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944c651f384---73359234202.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbdcbd5f39---41925793125.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zezobuwunanufoxodubo.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wamilutugis.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/49859044115.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/vomolovi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18fb412e3---66310297356.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/kajizomimabixolomema.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/dllk6r2vrr1a2rvpdv0vja2osj/sikujuvubivijopiwiwe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e250bc475e0---87729945737.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513d7c57de---xoguxaruveresesefewokigo.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/54072340554.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/dinogizapinidixerij.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a543d62aab2---37937779824.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2f2463b4e7bf7b5927be357e633a81d4/46889878803.pdfIn PDF document text
    • http://live-net.it/file/mafedisira.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c637d3521ab---lawevarajujej.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210630034336507.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_off00014b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0A 19700 bytes
SHA-256: 2e63205fa47e878ef7af8cd0116496179fe7255cf1db6798f34e64b507690679
font_01_sfnt_off00017fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000197de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197DE 11384 bytes
SHA-256: f549195879e7022258ea40ab13bd3e5b00ae4ed7564378c0a426bac10a815151

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