Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c16959b4868821…

MALICIOUS

PDF

94.6 KB Created: 2021-09-04 18:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c91a15a460175342b29cd099e844ced7 SHA-1: d8d42b5632650163f933cf46da8b0eb912527aef SHA-256: 92c16959b48688212bc2289a39d3f5b8964dca83d3ff39c02ffca971b3c7fca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccbb0c4fd---lopogusutebawivomejiw.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/28d0e2760c9195f2523b6d2e57144e14/gigoxabava.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889f71dc112---nanasivodo.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/72650254323.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/50299587770.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/964f82aabe0835bafa941a5871ba851b/sozepaxalaviduzegejuzig.pdfIn PDF document text
    • http://texmet.pl/userimages/file/defepu.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/wuvuzu.pdfIn PDF document text
    • https://strechybenesov.cz/content/65663848193.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/talofosil.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/60478544210.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/8946112457.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/miwimonifakosewigutu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/gv1inphltrmf1jg7gq1tfkj3o2/kasemomirurugarubasib.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/duxukimaluzibiwajigugupa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xajukunagaxariloxokuxemi.pdfIn PDF document text
    • https://ka-base.no/images_students/files/99718308713.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4a23fc0c5af1c3e9a6fe330fd22e53b1/kabaputi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9c57e578d3f57ef4f4d1b13c064cf76d/78792411828.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/28omga8jcestu1hgroj626e4e4/61501229133.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/81578142002.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/23492808054.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/56736037673.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/25565152080.pdfIn PDF document text
    • http://rubensova16.cz/files/file/19163580751.pdfIn PDF document text
    • https://777mto.org/contents//files/91488141538.pdfIn PDF document text
    • http://abpaluso.com/upload/file/55208766751.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/42793505783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tsugami+m08sy+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_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10748 bytes
SHA-256: a625e7a423d7c874429f37335a487af159a15cdad24c7ddf4b52ab8710dc6e6a
font_01_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 19280 bytes
SHA-256: 6c6c81feafaf45372a37e51b8cf90e70fce6d741ea68f2874b600eaebf97c0f5
font_02_sfnt_off00015506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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