Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b85365f73183f8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 03:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc09ff1a1d7422d10fa9ebe9d83863e2 SHA-1: 04ad0a63ab4f56b59e2f60e9633042929d157437 SHA-256: 63b85365f73183f85c8a8aae8c1698fad2d7a089413e1ebbf5d2b85472771c40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://robfredo.com/userfiles/file/sezanuwezox.pdf In PDF document text
    • http://abwsalisbury.com/uploads/files/74405247564.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614017ef5e542---mirejugadakanim.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/56335472035.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/fakuvotivetuvekemu.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/81862602332.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/15070849964.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/66272224132.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/32273003898.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/74258566590.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/fuzunofiroguxojozofuxiz.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e93bb23ecef2c000d7ac379ed61a2b92/wakulalabalevowam.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xipanidipila.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/wibojezuruxikubuneg.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/wixugujexawuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c39c021f---migedexedajaj.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614469a72ba3f---pekadisivogumufudesamut.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/26549325728.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/faraliz.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/45699597156.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/warogen.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/milolovowirofan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=art+music+studioPDF 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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 10168 bytes
SHA-256: a11d6c46ae76b8d87f0eebffc0630c20cdbd00b038e6b4cc4a76370acc9d7b75
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 19256 bytes
SHA-256: 9e73f85df736abc62e2624076947f36730207b6daa76d7014cac6d731ab3e773

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