Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8e73e293069d7e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 07:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52b0515f6946736588aa61e8909a526f SHA-1: e20e3ed50fd4693b7ba63141dcb238b8b109c85f SHA-256: 5a8e73e293069d7eba06e445b2b71c39fa3aac7f8c9405c1df0a6a4e21d84d46
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_CALLBACK_LURE' strongly indicates the document's intent to trick users into making a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crysiq.ru/uplcv?utm_term=autocad+360+apk PDF link annotation
    • https://projetounificado.com/uploads/files/perovugikajilarirunobe.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/71757425404.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329064a6f08---kedofofujogumenoletelovi.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/70928697438.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/46441744744.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_160343.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091119051099050.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/80960353959.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/88745329764.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/7524330756.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/1655400992.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/tededetozej.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423b346b654---texete.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/97298525227.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/32154823743.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133063c4b39e---82160201019.pdfIn PDF document text
    • https://kede.org/userfiles/file/1939946700.pdfIn PDF document text
    • https://derfo.info/resimler/files/82208281383.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/lebedaboduzib.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/mezepi.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/93896916145.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/1739593860.pdfIn 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://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_off0000af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 17160 bytes
SHA-256: 0a5d436f538496e95f3215f06d71640f03f8caa9a5949947ad21d6d0c3e4d991
font_02_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10500 bytes
SHA-256: fbf6d7faba3faebcf74a344503078124fff2ef99e74aea545610fb16d0926109

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