Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f696e2f260d2c0…

MALICIOUS

PDF

98.6 KB Created: 2021-08-28 18:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a865d21d1c1da3a6c30c6fe9dc56372 SHA-1: 04e154ea3839630db09e4125c3f69852ffafcd17 SHA-256: 87f696e2f260d2c0bb24429fd5f2562eceb4c3ddc5629190804e4d0963de22dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked sites. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://longvu.vn/Images_upload/files/kuxezazazugureg.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf5f46668f---peganusiluz.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/novemupitekojumizubipil.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/57869692160.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/27455216561.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/57202410883.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4a1cb0ac---65167994643.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/72537980919.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/68373776643.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/33618248176.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c64549123e1e9df5bcf98ad89619fc84/rejowolezekizika.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/53198055661.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0lfefjopsp7pth9cvq3jekpst6/56495934935.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ibr76b1grb49hldmftqbaehlcq/86638789554.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/deruwozunogubudanesus.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2e1151759---totonigenuj.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210628035910382368ayw23y.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c5c2dd1bf---56683171666.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/24195353090.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/83384424689.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/nagizamew.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/41269926306.pdfIn PDF document text
    • http://vanhacollection.com/images/files/padivuxupowawi.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/61187414001.pdfIn PDF document text
    • http://abnicum.com/files/file/58092231810.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41ed619ea---14382357422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=conscience+of+guiltPDF 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_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 19324 bytes
SHA-256: 36fc36dbcf18ceb3ec19658a909bed92cb2f35716e2cd658c630c1b077e5b3df
font_01_sfnt_off00014d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 10380 bytes
SHA-256: 10a5b05330cb478d8b8038884d922bf023488d37d71cc0945dc1b7a378e30edd
font_02_sfnt_off00016503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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