Malicious PDF — malware analysis report

Static analysis result for SHA-256 477eb270bdcbe5d1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-23 02:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 817478a3ac3d6445a5c4888a8f4baa84 SHA-1: 4281c1dd39844396d7cbfc3a59b45c2cccac75f9 SHA-256: 477eb270bdcbe5d1a9892bcb40f632294fb82d878015e60ec55c9cfc470250e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infinity-c-t.com/userfiles/file/24723418625.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428d33a4fda---61166544548.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343916dc6eb---41839743274.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d70cd4890acbce82c85f0f97bcea79c0/28523310774.pdf
    • http://mabo-meccanica.eu/userfiles/files/lopewikobobawuluv.pdf
    • https://rumputhijau.com/contents/files/govafasomasopek.pdf
    • http://miet-boot.ch/images/uploadedimages/file/66795238356.pdf
    • http://textstricker.de/benutzerdateien/83926551897.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/puputawetaduzosufemumuze.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xivedapomatibuvose.pdf
    • http://www.77ice.com/upload/files/81871027093.pdf
    • https://ymy-tea.tw/upload/files/98848645056.pdf
    • http://amongelite.com/ci/userfiles/files/37064170834.pdf
    • http://stacjaregeneracja.pl/userfiles/file/2527228746.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/17393660399.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d680fe6543f6241664ecb58b091451f1/28016063501.pdf
    • http://crescentcarpets.com/userfiles/file/semonokuruliwasur.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/saruxotat.pdf
    • https://letajicikoberce.cz/userfiles/file/60973710948.pdf
    • http://www.anjhimayath.com/upload/file/99151930582.pdf
    • http://www.anclupnapoli.it/userfiles/file/98763475993.pdf
    • https://taptigrihnirman.com/singhania/downloads/file/merep.pdf
    • http://gainliving.com/upload/editor/file/97905758473.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+clock+to+military+time+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39b.bin
b814bed55e28ff661fc879cd0f42db9f7cdd5b3b56ddc3a1f0913f31af810016
pdf-font-stream PDF embedded font (sfnt) at offset 0xC39B 16768 bytes
font_01_sfnt_off0000eea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
font_02_sfnt_off000106bc.bin
d25d8d98a80309775600bb311244e7bc8e84436aceaa7d08adcb58a03e493272
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10932 bytes