Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ae903f88114fbb…

MALICIOUS

PDF

97.1 KB Created: 2021-09-06 09:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f16bd463d804d29300559a60df95afa1 SHA-1: a0f9fd8a7e06951dd681f47eebab15d6ee229383 SHA-256: c1ae903f88114fbb6feb1cefd0b470d24c4223129501cf95206ff090f8dade19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further stages of an attack, such as credential harvesting or second-stage payload downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=pmdd+symptom+tracker+pdf PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbe2ed5a1---mamajenotaxed.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/dikazubakewasapenu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/46182863086.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089efd20c2d4---48694083692.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a7f9e1031411d562564fdb2b732f121a/xutagixedafom.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/xaxinorododipedakilix.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/tupaki.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160894ac440606---91773966889.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///wodotodufekebedoj.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/barozugovis.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/65277202099.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d48ac550a---niradavawasoxogonupenovem.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/dejupoxotasaromerud.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/xikanibojidukaso.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/nilusumojosirarobim.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/48670584314.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ducc8ls9s686suhliqcjf4pa45/xevofudejep.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/lajemelaxomibimezo.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/wozudemoled.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/kugepesesekuwujupafi.pdfIn PDF document text
    • http://henca.com/files/details/file/13005653407.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_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 19492 bytes
SHA-256: 4bef3083c745bc211455eb696605de45500ba734450dd67fce77055ce00c83b7
font_02_sfnt_off00015dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD0 10748 bytes
SHA-256: 63c66eb1c8cfe0b9417ccb3718898b0f240a4c03a5556124a65ac882263fc0c1