Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaded8e3edc5fdbc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 16:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03b2763ee9673e16ff784d207c29e67b SHA-1: 17d7cb8fde4f96360a5c7c0d014f4379498addd0 SHA-256: eaded8e3edc5fdbca6f26d3afe1ff9c3d1da9fc8538f85bdcc96443bb6f3bbfd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of a URL with 'microsoft dynamics ax interview questions and answers pdf' in the query parameters indicates a lure to attract users interested in specific technical content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac716506f6---86685205726.pdf In PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/27823550621.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/magovagavi.pdfIn PDF document text
    • http://potlista.com/file/files/32425616936.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/sajudalex.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a339cfe1b02---3086398930.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/17259f0402e2fa2f4ad2b20bfd30b5ae/kikepexilurixojobojoniwi.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/xozofogajarogideleno.pdfIn PDF document text
    • http://suaups.net/userfiles/file/81624324438.pdfIn PDF document text
    • http://bankerz.in/qpic/files/17322039903.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dmj7pp49c48lqjlvo3rkqfisd3/visufoxutib.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/tutewokaxifogok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=microsoft+dynamics+ax+interview+questions+and+answers+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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 17516 bytes
SHA-256: 513e596f8658753f48ac9179968389cd9120f012f221b2ba7ae1a1acb18a0a01
font_02_sfnt_off000110ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EA 11344 bytes
SHA-256: 228e87d0382da349bfb0666189dbc596db10aefa2fb2f9f292f5dee87d03d28e

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