Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36ceaa8985117c9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 12:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24b00fe616d78210631f2617902c8e4c SHA-1: b7c739b1dd81d8a3d16cddca55f49c3a80198898 SHA-256: a36ceaa8985117c97672eab00bcc85dbb1416ebf7efd5459ab5a8fe3d6c36c94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports the malicious nature, likely used to facilitate the redirection or exploit vulnerabilities.

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://infrive.ru/uplcv?utm_term=all+photo+size+pdf PDF link annotation
    • http://booklandbooks.com/userfiles/file/rerubugufinatedavuxi.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/75482904442.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/suzilofutumulixevi.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/2433413122.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/911086203.pdfIn PDF document text
    • http://vucert.vn/uploads/files/44075057195.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e177f64c205---makotosoresasas.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/daruma.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/gijunilonuvizavovi.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/96970383623.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/sulebijofugokemojesep.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s6hchve005ovohmc2l73uh676c/nakezazotagesajogoladupo.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/91105436160.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j3scl78jjjh97u635efr7ptu14/magukemonosezu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cf3b0357---miloganadezapibevikesuxi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610afea059939---wufuja.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/39403468641.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/43430760785.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/linububopusepiju.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed238151c---darolovivosexilonuk.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/texaki.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/51089194026.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hudsfjbgip8kht7auv5q2vbvlr/nosobat.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/nl2gonj73pjs4nmn9o9dce6m51/59646662878.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/51062257010.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/desitonuvemurirupipojijo.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_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 18672 bytes
SHA-256: 075ada709ea6967f7197a85820514aa8ad9aaab074192452398f7225ec43bb82
font_01_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 10272 bytes
SHA-256: fc058faee1811464d02f0f9cc518f1c86a063d2ba3d9993659c4a4a60ebd432d

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