Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4a750781b84b61…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 08:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98ba9e49d4e2242f2bef5f50fdcf277f SHA-1: 5812616565998cabec793d00559ae52b374caa62 SHA-256: fe4a750781b84b61ba22be61a642ab7f0dfb2d1d9ed108985c214a2833e31d56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=openvpn+apk+android
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6421859b4---94095670378.pdf
    • http://metisentry.net/ckfinder/userfiles/files/nunatatidame.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/98279531212.pdf
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/sejebun.pdf
    • https://silky.ae/images/bulk_images/files/11344244988.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386af66b41f---sijimavanubu.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/febewidiromusilonoviduze.pdf
    • https://spandoekland.nl/userfiles/file/36914686332.pdf
    • http://unsersohn.com/images/file/sedezafedediwa.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16422536618.pdf
    • http://rutka.pl/media/upload/files/6692ee3e84b5fed774ff59576d952e97.pdf
    • http://rydelko.eu/userfiles/file/lifixadakafigarap.pdf
    • http://diagnosticaedilizia.com/userfiles/files/33428751156.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/neboxolu.pdf
    • http://om-ar.com/userfiles/file/54486571565.pdf
    • http://studiosiriosrl.it/userfiles/files/pujebuturesulowedagobe.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998a949289.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc2b132aa---48288352521.pdf
    • https://gplacestracker.com/userfiles/file/91068465176.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/tuvub.pdf
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/23881855449.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_off0000cfc9.bin
de73a8e527ea9e44f11bd57ede1e0fd1d30e939ac4b017a61a0ac72759ba7215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 19148 bytes
font_01_sfnt_off000101db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 16792 bytes
font_02_sfnt_off000119f2.bin
5ed509b93f22a79258d060a71c8f9d684480c7a9e3d6d10a9ceeacf5ac15a465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 10256 bytes

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