Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a532ba2cf0b540c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 02:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35238ec70b8457aa78ce8dd10be80605 SHA-1: 865d7ed0b5865d4600030991b5eae9faf553f95c SHA-256: 5a532ba2cf0b540c4261d3c591582256952d2b9d6843a257645ed20bdda3ace6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to potentially harmful sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4b1b968bd72694e08e7058f001acf4a7/48912272894.pdf In PDF document text
    • http://way-of-spirit.ru/upload/file/kovolawedumasigosuzases.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/tarexifonafa.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/narezeworukuvasoso.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/60957275288.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0b783db14b7f30edea649de81334bf25/93768344862.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/29115022033.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/43485678284.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15189295369.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/jemonugivubunizu.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/8380949923.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f917b4ea921828da7306276d0acb015f/wukosinatebiduzibivuded.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/8723281051.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/midigunipuwuvaloz.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/5418390923.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/54973600156.pdfIn PDF document text
    • http://irinabailey.com/upload/files/86075640230.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/bipugokopavojazagewivixa.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/8461280970.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/dixosomalitulixi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/5702242349.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/26011022396.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v8l6kbrp6bfdoc1e988r9pq2qq/45146552737.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/39242810143.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u48ifor7bmo2u8pcs9bvdcrbmm/kugititosekofarisaj.pdfIn PDF document text
    • http://biosite.ru/images/news/file/fuxuvesiseko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cara+menyembunyikan+aplikasi+di+android+lollipopPDF 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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 16116 bytes
SHA-256: 7ea092ed3dfa5d53fb8d4143292d30a0463e823e5d53f6da1e5f0ccae1a4b724
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 10932 bytes
SHA-256: 777dd7e513029e915235d4142df997c05ee09b13deada1af40c71e2914402680