Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a31fef30d06fb1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 21:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53e9315a07c8cf7ebc45fd5947819171 SHA-1: 14025fd5ee45aa532185c43d63b202b3baec5611 SHA-256: c2a31fef30d06fb194d5e4431a134d8f48919ed2338ccaea9f93f9ec10474587
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to phishing or malicious content, as indicated by the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The embedded JavaScript likely facilitates the redirection or further malicious actions.

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 http://lngpetro.com/userfiles/file/88997911882.pdf
    • https://pnlcoach.com/misc2/file/
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/75365555948.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/76371376900.pdf
    • http://datacomsystems.cz/userfiles/file/15643145768.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135312c4192e---99632712436.pdf
    • http://jpind.pl/userfiles/file/42958907047.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140524d1c68a---vuruvurufugesajaxafisemem.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6s8uto50sji38n07dmf59ori59/71680047772.pdf
    • https://85097781.com/upload/files/razozabolaf.pdf
    • https://newfrio.com/userfiles/files/wulexidijabixo.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/witodenidex.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3cgcf5llsin0kt57hpejbfig4e/69273874826.pdf
    • https://tigaintan.com/contents/files/buxofitixe.pdf
    • http://sung1.com/upload/files/58733461929.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/vigugisaro.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad5a431e---nusinebikotoxad.pdf
    • http://lawyersmarketingusa.com/user_upload_image/file/
    • https://hotellemaritime.com/hotel/upload/files/jexodawetudozebugij.pdf
    • http://poetische-malerei.de/web/editor/files/gatazamo.pdf
    • http://delfosventures.eu/userfiles/files/56185610714.pdf
    • http://agenturamotivace.cz/uploadfiles/file/33070973240.pdf
    • https://egyediajandekotletek.hu/mvc/userfiles/file/63446673209.pdf
    • http://silver1979.com/upload/file/7723517035.pdf
    • http://tandartsindex.nl/images/uploads/49137713706.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fortnite+wallhack+aimbot
    • 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_off0000d95a.bin
8b1aa24ca170dbee077e707be6ab27ea4abb28fcbd57359cc71bd311b477c235
pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 10620 bytes
font_01_sfnt_off0000f172.bin
cd770f2ad25c14342d886e8f95575c2014b242fe2308113446f014ecfc282111
pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 17148 bytes
font_02_sfnt_off00011ddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16792 bytes