Malicious PDF — malware analysis report

Static analysis result for SHA-256 f132f1698caae6c0…

MALICIOUS

PDF

86.4 KB Created: 2021-08-21 00:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf3d83a072822162ebe062db240ffa0a SHA-1: b4d6a0356e48f5f44c2716e583e4db343462f455 SHA-256: f132f1698caae6c0ad43441991eba91486a950c44389d16ef413251162e14eff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external URLs, many pointing to compromised CMS uploads, suggest a link farm designed to distribute malware or facilitate phishing. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://irlanc.ru/uplcv?utm_term=house+party+free+download+%28v0.17.3%29 PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72fdce075---26853814008.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/48494223428.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/49106929617.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086daac886ca---loxisunibez.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/caad24a0b3bdd787c850ae6b5c21bd64/44709875729.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b0a2aa7482d89bc08a7e93f2cb5d52e6/tatixebotazitolajug.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/voxawake.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57ede8a77e4d6cbb2daa5fb834a1bd5d/jewuromosuw.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/31985279874.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/jolotisar.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/86743186679.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/nu2m6o5abgag8t457k9vo81ga8/3088345129.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bfae6212f7b8a14484c0e783972808a/35789150069.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d17382bd---17767321468.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jiveteteveti.pdfIn PDF document text
    • https://jetaime-shop.com/files/noririrupidenir.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/nesizidiribozexirewesov.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/50bb211c0cd9bb1340976d15b7e0d91c/77628264929.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/roxupopikumulux.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9650865c3---wafezavototo.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/26452860493.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/70669395342.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/23914535283.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b237df26e3e---datonewogasesevukeles.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c7241a58---50907679566.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/92888002588.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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 17816 bytes
SHA-256: 3cfe6e56044b681408bfb8fc8c497d1582ed32a17337f2140bd8dd57ce6043aa
font_02_sfnt_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 11372 bytes
SHA-256: 1eaf37a9bcfc206c3b14102cf853eeb092f5509aa3c10d3ce1156ef0471d2671

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