Malicious PDF — malware analysis report

Static analysis result for SHA-256 114f154f4961af30…

MALICIOUS

PDF

69.7 KB Created: 2021-09-15 19:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d6802912a56d43e6b46107e32bb646e SHA-1: 7d34b68f58cb7e189a41518d9af9cfd5ffbf75a5 SHA-256: 114f154f4961af3039136060f0b4e6f545db53e34808c51f690b29fe94471d34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as search results for specific keywords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=chess+strategy+and+tactics+pdf
    • https://krantiservice.com/ckfinder/userfiles/files/12284200148.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/51139351151.pdf
    • http://tubelessons.net/cms_images/file/nidal.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/vewipijuxowik.pdf
    • http://rem-proekt.com/f/file/dokozas.pdf
    • http://csc-0898.com/userfiles/file/20210901140945_0rxgom.pdf
    • https://majorsagilekvaros.hu/uploads/file/kuvomanumewezekivaxiwu.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210906002306223266zxn17n.pdf
    • http://ramenhajimetustin.com/uploads/files/46852641288.pdf
    • https://istanajpdua.com/contents/files/23690032274.pdf
    • http://pallenberg-busreisen.de/uploads/files/rokikabazir.pdf
    • http://sasolution.kr/userfiles/file/57801167834.pdf
    • http://foto-recepty.sk/images/fotky/90176822299.pdf
    • https://ruedi-leuthold.com/userfiles/files/wapoli.pdf
    • http://zussobrance.sk/grafika/dokumenty/petogufipudiw.pdf
    • https://datajournonepal.org/files/vemepipizejuwofasij.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/9221679407.pdf
    • http://studiomanzetti.it/userfiles/files/20820463399.pdf
    • https://rimsball.com/ckfinder/userfiles/files/tupetudopekaseba.pdf
    • https://natinsel.com/imagenes/file/palamekubo.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5378909d8d88d3477044173a440b28ac/1894707665.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/13594903533.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613222e45995b---52466584001.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a5a67f0fd3fe8ca788681d1bf78f4956/dozutozejuj.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5k951820sk771pnjk1bbtf6to4/23500784200.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_off0000b43f.bin
92956c33bbfdb227de6300011c2c4e37b2049c77becbb5cd055860ba72ccc51d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB43F 14336 bytes
font_01_sfnt_off0000d7b3.bin
379e00a1a17823581da7b272f7cb0d071d12db89039de17e47eeb7cf57087230
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10876 bytes
font_02_sfnt_off0000f0a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16792 bytes