Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e2e5a845f780d5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 23:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22e24716d022519bd12190c162263e8e SHA-1: 4a67d9fd4da3a72516cfe491bf4d06fdbaf5a4d8 SHA-256: 57e2e5a845f780d5e9b8a5ddfa9aeb63d6ab7b6539f561b302a3bea9aa452ef2
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains links to compromised WordPress upload storage and a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fbpmu8phjf9qeruj4ejl24k07j/xasulenararugete.pdf In PDF document text
    • http://studioguagnoni.it/userfiles/files/94826599415.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083337804ed0---44355797597.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/lrpa4rjr8s9j2954ma95h7jk07/remedojevuvijilumex.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdee68970b---81265040832.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/rodag.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/58799917094.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/68549092007.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/jopuxufip.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/25207783399.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021816725139503.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/vujadineteruravemu.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/taruzukivonesebalazok.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/81tliarvq4bicvjp4oc4r9gt50/vekebunupewejova.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/purasixesozojuf.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/16056819327.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cbe26125---dulusiratizefesiwe.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/48358556695.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n6q5lgj72gpmn8vm287q07opnn/8148804294.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fcf437553b352ce6bba26ca4169213df/zaxanalebawozabidifaxi.pdfIn PDF document text
    • http://huimao.com/upload/xeninuvuxaripulalugirudid.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xewunakumik.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/gasopetezogokowal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rti+application+form+pdf+assamPDF 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_off0000bb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB44 15404 bytes
SHA-256: 4503c6ab563283f0dada2ad6188afcb9094f29f60538fb3aa2ba95be94bae9b5
font_01_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10696 bytes
SHA-256: 114992ca72e0d47b74a4154adec8a3e70c168d5fa03203b00e56e5fb78d90981

Open this report in the interactive analyzer, or submit your own file for analysis.