Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e550b87ead7a8a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 08:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32b3a87456ec7502cc445e32fc4e5f6e SHA-1: 440912293fc8f4ce0148d30969730eb4eae91ae8 SHA-256: c8e550b87ead7a8a7a28d4eeb015bf887aea6e0f5e674f76952e609c773fbd05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://adams-gold.ru/archive/image/file/bitogotasalajekoz.pdf In PDF document text
    • https://semineebrasov.ro/printuri-fi/files/40845856327.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4d613444a882d9b0c7a66f671f01a821/96307564685.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/6jal8oe8d17r5u1164oc1gq17v/tazibubukujewuxewujutilu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf317419a---71310286337.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126bf1d2d9be---xafemaworezixufebom.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607024a92f6ba---zokexudizuduseguguko.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t19c0j9aujmrk49u5jmu61lob2/95263587983.pdfIn PDF document text
    • https://termofriz.rs//files/dusukusogodudepifinesawo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781737e9247---21108122184.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2d53d7da---rekakur.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/1820663886.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/somuwotubif.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/26027829072.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/29464294642.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/86254364378.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/giwekomufesasogitasefep.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fdauegfp60gdqo897q8npmr754/53952740046.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ba4267282254d31d0af93359f285f665/pukakubike.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ebb841a1041313d8bafcc47da27ef1e/7589526061.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/kipaxitedemefadeselonilo.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/rubuvorefolobolenanaxifu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/7eb3f9da428510e14709cb46ded574a7/59435244249.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/nosamamupamerugimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=trypanosoma+cruzi+ciclo+de+vida+pdfPDF 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_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 18684 bytes
SHA-256: fb593384dc48e2fca45c3a54b0a1b53debdf858192f994348b12a6c6751a39c7
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 10988 bytes
SHA-256: d0bf6ce74684a3232e646debc44d0bfeb5cb7bc1cd510b3da61fa17ae500df0d
font_02_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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