Malicious PDF — malware analysis report

Static analysis result for SHA-256 87361791933c0c63…

MALICIOUS

PDF

96.1 KB Created: 2021-09-21 08:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7ae51ecc6568d689f676cd6667b7209 SHA-1: 3983d3d56a016a5183b270ac7d16075565eb817b SHA-256: 87361791933c0c636e279c6786b8fd405e55e841a95c7f5e4676667c0fb74039
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic firings indicate it is a link farm designed to redirect users, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=quicksilver+avengers+and+xmen PDF link annotation
    • https://sieuviet.net/webroot/img/files/37679993131.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614090e193e5a---wuxetenonorazu.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fevuludafomodojowo.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/rawusopopunejo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8350ab006b80c3cdf5f9bf30c9627b3/silusunezufowuwaduzor.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/59122835393.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/9414911662.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4da36420---gilufut.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/50407474364.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/64569822217.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/famut.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e1766f14a2604eb8c54bb6bb31823d21/lupakukogudowawanam.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/mifiguxuvekulabeme.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/77774727989.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/59318776852.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/55358107140.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/12955436268.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/jadenepa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16149256cf36a0---riwadopaboz.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/jixelaxifom.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/sufixuzila.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_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 18308 bytes
SHA-256: ac7085d5b366e16cd9d73771db305a7eb3ab4277dc2cf767c59533620cf9f9fe
font_02_sfnt_off000159b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B3 10916 bytes
SHA-256: cbfb657faad9c274a76d9b0fc44a895b48689bb84abf9e4d3b5449bceb067626