Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cb0435254aa5f1…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 11:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e23524fe37d5d85939a599e8a27b46d SHA-1: 11ee69a822042805fb99cdcb2ed35627671e5105 SHA-256: 78cb0435254aa5f1591f56d16a1b14cdd88658a53454aae6009f359327107e68
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into downloading and installing malicious software by posing as a necessary browser update or plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • 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://radtel-sport.pl/userfiles/file/vurabuwoke.pdf In PDF document text
    • http://atoutslegion.com/userfiles/file/vofamewesoselife.pdfIn PDF document text
    • http://teakdeck.pl/files/file/38520682967.pdfIn PDF document text
    • https://agatanorek.com/files/file/nebudikojana.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/fudarewovidogisuvivejake.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/gijowu.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/banukomemukenobupusufam.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/wakonafamajexidupusixaw.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zudowuwibibujuli.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c182ce1611---tevonufanuki.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/25860197912.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/24830399510.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0f78de39---47702074857.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/88656513838.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/ranojakasiravilixo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613accb6d5dd2---68848090944.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/revigapilis.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/10466952258.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/33952066802.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c220e8a2ef---kafafoxekidubajidiwi.pdfIn PDF document text
    • http://dobermanncz.eu/files/3865826613.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/99887992409.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/41660852975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+transfer+data+from+samsung+to+iphone+12PDF 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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 11248 bytes
SHA-256: d46f3354604304be35fe8f9890c87c2dc0ef8b1af16f6f6a38fb50f3d4d7bfd8
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 17188 bytes
SHA-256: d1a9f2cd26fe29d20407f673b9ffd44fde296f917b0bcbea81162438f502e7a6
font_02_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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