Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e836d38c951a47a…

MALICIOUS

PDF

120.1 KB Created: 2021-09-06 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64bde9c1b0fd92591cd62e40fecf2d26 SHA-1: d241cda2ceab087599f4df755b47ca37884d21d6 SHA-256: 4e836d38c951a47ad86be6dc4d284041d54cc73570427ecb023ce9666e50e907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • 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.
  • 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://bebelino.ru/userfiles/file/18144226749.pdf In PDF document text
    • https://advantagelic.com/singhania/downloads/file/kunuwuderemaxe.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/39478549519.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6169cf42c9c3c3f6ed8bdc01b3e5a7c2/nunata.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc199c57c7---pusuz.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c96b1707a70cc73c85b0ddc574e8bb4b/69252885436.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/40985385250.pdfIn PDF document text
    • https://mmszke.hu/files/file/dagupigarivabepan.pdfIn PDF document text
    • http://pasted-radio.de/web/files/92901577785.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/xoduzarejikaxiwiwafomozi.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/fojobofased.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/47818045176.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/noluferolawukukobasux.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a710804931f---kotuxutupen.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/41221839858.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e52e8f529982d7169e88c35f143f0d68/38135147156.pdfIn PDF document text
    • http://fitviewer.biz/files/file/7569980661.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zojojajipufipu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1b2191210d090066f650b6a9ee28cf5/sevurijowetopijapawiraxu.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/95326759175.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607039f57947d---64500070758.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/wadumomojupewimuwugizemox.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/14838619568.pdfIn PDF document text
    • https://go2germany.ru/files/file/sudulov.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/bunesuderiku.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a62e1e37---73810391302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=correo+institucional+sepdfPDF 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_off00016c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18439 20304 bytes
SHA-256: c949e85d62c8b7686aa94055e941b4226f35b8c8c6d5191f0d161021c20487a2
font_02_sfnt_off0001b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7DD 10744 bytes
SHA-256: 65851511fa40a42675f5f901d5e4deaf756bd22e3cffb09446786e4289291e07