Malicious PDF — malware analysis report

Static analysis result for SHA-256 632ef01ff72076e4…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 08:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cbd78153b6ae46b9a20d7e51337dc8b SHA-1: 997fe28dfcd8943b9b2296d23099a4d1c620428f SHA-256: 632ef01ff72076e442e25194888f44c813c1e6aab50bef417ce98f580b664070
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic for bypassing gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://unicorn.mn/js/ckfinder/userfiles/files/lonuta.pdf In PDF document text
    • https://glaskunstcentrum.nl/images/file/22964812449.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/resufibokogijewa.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/18223728427.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jukoxowamijobusopadugope.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/28896220321.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/54526429082.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/vizakovemipibebovajo.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/41742953295.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/14570329003.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/3758188507.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/47816558203.pdfIn PDF document text
    • https://tekmaker.com/upload/files/pimepexuxibuxusixa.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/62300737058.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/pixakalobufuwofoli.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad3dde14---89416970879.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/sagowidubalabipabebid.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cdc0a4e4b66325ae99d7e1c2c29841d5/fikozupixino.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/47732441353.pdfIn PDF document text
    • http://araratmebel.ru/img/file/95252520593.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7d88e6b6---zubuno.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96683322287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+your+pattern+lock+on+androidPDF 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_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 18984 bytes
SHA-256: cf24fd462c67f3303c2d114099f389e7e3c7e6586a0fbf1ae38c3ae8a9065c5f
font_01_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 10956 bytes
SHA-256: 29723bd3b3029fef43b53fe4f926ff4171e82d042fd3bd80ac1a6844a05265d2

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