Malicious PDF — malware analysis report

Static analysis result for SHA-256 155afc7495f240ba…

MALICIOUS

PDF

68.1 KB Created: 2021-06-13 05:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ed307b72a3b97100502adfad77d48e85 SHA-1: 9d1d6a484863ca8f72d9f8087217a408c9073b98 SHA-256: 155afc7495f240ba8dea389e37404f144890e040caf6b96d2c0da1ece7b5c675
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document impersonates a cloud file-sharing service, a common lure for phishing or malware delivery. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://smidgel.ru/uplcv?utm_term=how+to+convert+pdf+to+word+doc+without+loss+of+formatting PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ff56712b---wonojuratubito.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5aed57f0719efb2987d6128818edbfb0/rasibibowevekepiwesone.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/70109363310.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f3d6c56fc107e4d3f92c780056c2ac10/guxez.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mpfaftnritq68p00k9t11mcph3/novutofoterubifuduz.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/visivubim.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/56231686240.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/99995419500.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6fa530fb215667216c027224ea53992d/zatujavofunamon.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606caaaa71d9c---98617982304.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/42060994723.pdfIn PDF document text
    • http://dgjst.com/upfile/file/88859943281.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0sriqfgtioolgun0hkv1n24a61/sesepufojakalerake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 5680 bytes
SHA-256: b05afa578be76813d7119c44fbdaa5c909c01a8874fc5d016e462a6c41034152
font_01_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 10636 bytes
SHA-256: 94990c95ba5f29bf5c6bb0eaf6dec61b1512cc57ee9e35610e7857eae8e2d2a6

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