Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25f445b754a6f7e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24cffdbf68abd8b7f13944aa28f12d8d SHA-1: 93a92549d223c3ebbbc4afd1911db8c2db0b20e9 SHA-256: f25f445b754a6f7ec44ad704902f3a218089a49300f4f6bd740abe1238aeda6b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://nomylo.ru/uplcv?utm_term=avatar+the+last+airbender+game+android PDF link annotation
    • http://fibertechnique.com/tmp/file/215541280.pdfIn PDF document text
    • http://come2menorca.com/images/file/mujitasigikod.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/zowaza.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vozapaganolilu.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/movapetuse.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/72964982045.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/bomapumosonete.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/195018430161425e3c32eef.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/mafuradetonowes.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/wemexodorobaxul.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/pewarefakasepemajuvu.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/10237135892.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c625e3b03398ccfc061189767ed9a9c5/31418716367.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/ninifusolibufalusa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/330db869201b1c2fafd0ef7192398e99/feriwenulu.pdfIn PDF document text
    • http://velisend.ru/photos/file/33435359217.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/budofebulonipodasizolofuf.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/70278444700.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/satibir.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/190506467596.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4c198044a2aead5376005d90f6e63332/65574769534.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/84783528769.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d33e30b1---netogaporawogewazufu.pdfIn PDF document text
    • 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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10884 bytes
SHA-256: c8384a636818c1ca4534c048e1d2b6b2f4e0213fed831cadcdfabf65907cb336
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 17508 bytes
SHA-256: fe69bd783bc01d53fcfb49426daed3a73ce13bd521962402e903e6c3e8e25d8d

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