Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ef10bbc5ca12b7…

MALICIOUS

PDF

79.1 KB Created: 2021-10-09 17:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f4fe3b3ce29de99f545242412b45de72 SHA-1: ce4d54b0ec8db65f809d3e49b37f53e249ed46cb SHA-256: e9ef10bbc5ca12b7ba431ac7709bab18f9963c949c36272aa352e83fc4ab940e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, strongly suggests a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vizugy.hu/uploads/files/17037057637.pdf In PDF document text
    • http://indecomavo.pl/userimg/inc/sikawefifasagabazonik.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1e8b9e4d1---40660495400.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/49590299180.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/sonuso.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16137490ddba2f---wekatijegujasalokorunu.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/49384660836.pdfPDF link annotation
    • http://tvkinter.com/file_media/file_image/file/zodamufebo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5aedea680---42665427419.pdfIn PDF document text
    • https://gangnampools.com/contents/files/64883804227.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/44525079818.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/tazikoxabolowerojejar.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16159ee6212dc6---16230859748.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efca5ec297---8509719144.pdfIn PDF document text
    • http://perksys.com/userfiles/file/vuxowemeliforawanuto.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/19323739969.pdfIn PDF document text
    • https://pindimana.in/uploads/file/nadorezipodapelisa.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/fatikekavowiwulexajusexo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af44cea316---lesunaguwuvaw.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/modivez.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/81750606401.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/29321664695.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457f77275d5---maxogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=control+systems+engineering+solution+manual+6th+editionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 20140 bytes
SHA-256: 2636f076ec948043c76ffa87240e74481200bc1307c4203b209975c6fa55ade7
font_01_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1