Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ca68a24b77a847…

MALICIOUS

PDF

98.8 KB Created: 2021-08-05 08:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fb722cbf4ed6d091ede8b5977337b1e9 SHA-1: 883133a7841bdb17fdb276e712c12dadbcc78c7a SHA-256: d4ca68a24b77a8474c0ddbc8e74585309d3f41f3badc79c06dfa5de5565ed47d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript may be used to obfuscate the links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://kururlaub-ungarn.de/bilder/files/fisupisujawepi.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9939b3231---62649149804.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/mujisutagogakelurezuket.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160995ec79bb6a---4901802075.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ddb047bf7273b12794db44213deaa3a9/wevazuj.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9eff60e476---25633675403.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160879d7976abd---40669936894.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b14dc3ccf---wokemubulavijudajotamino.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/jezeduwimegilakemorizi.pdfIn PDF document text
    • https://bloomeng.com/uploads/90660654576.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3d4a22a7dad5956a1f748717153264a0/diwupuzezutusamuze.pdfIn PDF document text
    • http://fabienneblavier.be/upload/files/80579377623.pdfIn PDF document text
    • http://abnicum.com/files/file/dafezofex.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/94637342696.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/buberativinuge.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3a1ce713---94083234826.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ecae1276---36504707649.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/kiwusikeveraviselasizi.pdfIn PDF document text
    • https://europartner2.pl/uploads/88944210238.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1106sq1cooh6jd4hu0mh65o8i7/gukunituzasinorir.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f35daa24---49420217367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+de+productos+notables+para+resolver+en+wordPDF link annotation
    • 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_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 11012 bytes
SHA-256: 1056967a7520dc38a983a3b8268bb88134a6f6c6dd68be9125d42b0d67032cb9
font_01_sfnt_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 20016 bytes
SHA-256: 47d919a4c7b53b6ea7a8f98f29b1c71f35ea7c4181f91ebf0e8cc68af583871b
font_02_sfnt_off000164eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.