Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac4f862595b30c3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 14:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8e8747e3bf170e7ebda624721af3593 SHA-1: 410c0ddd86680fa85a56b1190ee9c6ffd75cda76 SHA-256: 4ac4f862595b30c35a0af36e590de830362e105c4da53eedaf69a1e3ebabbc2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically instructing the user to engage with a remote-support tool. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading and running potentially malicious software or granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://promocode.lu/userfiles/files/noxiwutolenasedagupomud.pdf In PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/guvezafabivavu.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/valegijiw.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tuburovizakoraxapixux.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wisijukobuganopuvete.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pijawesiwibojixetuside.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134cab49f238---71547955408.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nanatavitifefe.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/jevedasip.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/movim.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/32776607154.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331fa31f5c2---vupelugebelufujojuf.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/741c3a6f725497c397f96da13a073320/kigatoguwurebir.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30377807537.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/8377860634.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/dejudamo.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/60896953228.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/4946064961.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8755aa028---83716533746.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/64106822090.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/47528045436.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccd471fd4---96160297032.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130ef4860430---baxozerubomawizisirave.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/safemapotumiladixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+control+an+android+phone+from+another+android+phonePDF 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_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 10796 bytes
SHA-256: 6befe59c05f609a1966044836fd0a6ebf1d39f97afd32e6c9881536d70f90c8f
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 17392 bytes
SHA-256: 000aeb96b8571f96f115af8779867d27fa587d2f82ae08edf881bebe0cbbfaf0

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