Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a24347981a9862…

MALICIOUS

PDF

85.4 KB Created: 2021-08-19 10:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8df6c166c78a6f7b96ae0938aeaec7d8 SHA-1: 1c84579d3ccbf6455a32b37c05a8f5272b39a86b SHA-256: b1a24347981a9862cd0c4036dbb922784930130e0843fe92c6f5d23063566ca1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://oniceh.ru/uplcv?utm_term=husqvarna+450+chainsaw+carburetor+settings
    • https://alirezamirmohammadi.com/images/upload/files/9198409564.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/miluxun.pdf
    • http://bdn10.cz/files/file/bapugomidatejat.pdf
    • https://parfumzone.ro/files/file/61715985535.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/86fee6113486667ef7f49d89cf51eac3/dawizibas.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/46202138625.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729e6e716c---viverumegogakawuluxew.pdf
    • https://palcev.ru/userfiles/file/94837960855.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1056b27da54b95f3ece58ad8d4eaace6/nafojatekitekub.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/564412d4ae816f4b966ce7510a6bf70d/7743660165.pdf
    • https://atlastoursntravels.com/userfiles/file/89364392174.pdf
    • http://oishisushigd.com/uploads/files/sidaki.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/54371437656.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/99195790731.pdf
    • http://yummyschool.com/_UploadFile/Images/file/8648603153.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/84187608764.pdf
    • http://synerfreight.com/syner_upload/images/files/takiwukamije.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2eeec02c---kumopewuvanipakeweweda.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/42753995640.pdf
    • http://residenceraffaellotorino.com/userfiles/files/79976494392.pdf
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/85008062164.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xogatezawud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b0.bin
be184a171ca579fb7320fbaf3663d443647d245882ba3ea69b7f76f67be7d141
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 17376 bytes
font_01_sfnt_off0001143f.bin
e755f64aec800d1725ae76469dcf780e8c975a44eb72fa140879bb9165ea00b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 11328 bytes
font_02_sfnt_off00012eb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 16792 bytes