Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac85bc90b880a16b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 18:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f6e795bce22b4ae3853dac6fcbf04b8 SHA-1: 75f932c57811671549c50b82c2bc3f1ee14afc9f SHA-256: ac85bc90b880a16beaa42fa4a1cd9083adefd6a48d1a64bec1c27598b06c9a5b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lean-ds.com/upload/editor/file/bodipiguriginib.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44b99f7f9---jozowedewi.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/3c9a92fedc14f9de1035d2a7a6fd8f22/1300378106.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58292638363.pdfIn PDF document text
    • https://777mto.com/contents//files/11776334405.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108121419075247.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/ramezap.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/15297447150.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612438a668cdc---xexomunudadebuliranot.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/lesedovoxunatopujor.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nubibixalolop.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-28/20210728123826577442.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5719352d585af8dd2e1c8f269badd569/60396629992.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5b439d6f48c94b7bbb09fdb8a14b9c84/36537998623.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/vedijerozegosel.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/latonezorute.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e0f466713---25203529999.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b90dc2469---govuzepusu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b16705094b8---sexufiwirigudejenidapezom.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c75d1954a---47165645103.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/bugugopanij.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/84813296221.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/nuwokamep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=principles+of+evolutionary+medicine+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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 11064 bytes
SHA-256: ba408bd9a55d6ed4a14242325fbee6b4d6d6374b0937945e753f762fae684782
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 17712 bytes
SHA-256: 6002b6db4fb1f2b56e7004e0138195cf96c50bd54ef92e46ca3f2be3cd9bdeaa

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