Malicious PDF — malware analysis report

Static analysis result for SHA-256 4817d234c413fce3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 15:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d93412e5192d1243183cabb43819da0 SHA-1: 9a85c3b0d1a6200692ece4fa2bf502a65504db76 SHA-256: 4817d234c413fce37a1fbbc255535c8205228c309f4129422770d7d0a5b11f7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://philabc.ru/uplcv?utm_term=semantic+web+pdf+download PDF link annotation
    • https://gea99.com/ckfinder/userfiles/files/lifawuvenedavitawuvozufu.pdfIn PDF document text
    • http://bluebossa.pl/files/file/guvepega.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/fejoxonadedul.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pexivovuwejo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/htm97dg7sbfjs3d4jnjte9tkgg/53480805189.pdfIn PDF document text
    • http://moristas.com/userfiles/files/43982405764.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb8d5c9d0---65638875711.pdfIn PDF document text
    • http://cutskytools.com/d/files/56731189024.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359cf491cc8---4576309795.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gavarefenomunexiziz.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/96025766817.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/71320410503.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/kobixekakedejesuju.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27431070571.pdfIn PDF document text
    • http://bptramptour.pl/files/file/74500887746.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109062256591934.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/zabexixabev.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/gezaledoredojavifomov.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/ganokade.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/45686844143.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/15925185574.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/fawufepogezufobisudusapod.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jcivs3d8r8l2o8hugcjeafrbg5/nobubo.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/jipupitobapugeburaral.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/31094823776.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/38578490877.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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10812 bytes
SHA-256: 2059c5a12c4fd0e21f9dfd0daf6b167bcdbd11db98aaad0ea8d7836d915c80bc
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 18660 bytes
SHA-256: 7f4e18af284a259c091556a1823dedf1fd963359696b33faad1c9e8e9b362920
font_02_sfnt_off000133f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1