Malicious PDF — malware analysis report

Static analysis result for SHA-256 944a12eecda4f182…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 06:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccbe208abfe5cfe670db6a94785c7f72 SHA-1: c09312571308ac7404810dfea82bf470d2ea655b SHA-256: 944a12eecda4f182bc3fab6a2a88c6ed3806a0853ab3ffce6e88ec79e3b9059f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://thegioicamdo.com/upload/files/81671273251.pdf In PDF document text
    • http://drentmedischadvies.nl/uploads/files/memurorunavipedotuganumer.pdfIn PDF document text
    • http://seritour.com/rsm/files/xebiv.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4aad547be---pidexeruwasuxan.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/36716806947.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/70172913301.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/bumininibub.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/72275823035.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/52444673676.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/kikobapolozijir.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/kepufixus.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/75720000245.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/kobopudevobabotekovexot.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/lepozakosexositidu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b9a6f7562214983090d39a052e776bd2/zapamudovuzolij.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/35952650188.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/giwinidikakaloz.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/mulubujizikogokaje.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/49212303028.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/nimekuzofori.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/wudozuwirukuxarewiveliku.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/91988979257.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4g9p94l1nhq9sd3mg8fcooav0q/xemere.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/62327773158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lucky+patcher+apk+download+oldPDF 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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 17920 bytes
SHA-256: 06461ceaee82b86a73755424ea4bb0d77ebed66236f72d58f9039f22980d01ea
font_02_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 10700 bytes
SHA-256: e3730cb44f2a38bc2289c972a42b7af168e673c1523e562b81157154394579e4

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