Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb591a8a324d62b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 01:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a43d47a3899726b073fe55a21d4e078 SHA-1: 7acfdba7d3647adf14dfb137068e190c53fa2611 SHA-256: ccb591a8a324d62bd05dc11eaf9b14049eef183ece879ae2c43e3cf68ac2c430
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate urgency and download lures, further supporting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=the+departed+123movies PDF link annotation
    • http://plenaseguroseprevidencia.com/fotosempresa/files/mibokelalisukafadur.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/18045961562.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/vulanuvulejosimajexizur.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/momidovoverubogepod.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/telalixowagi.pdfIn PDF document text
    • https://luminex.pl/upload/file/rebapolowusegarute.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/29205034265.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/81180828335.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/debumusupor.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/55961651782.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/setamemepefiganomemena.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e4t3h59724go081b4jmkn002mp/85562824615.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4snflpil5u3fd0haaavhilof61/nokofituvududunawiwir.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132336f91b92---bogusinitajedubewafowaniz.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/64642115499.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/pixekutasaxofeg.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/090438295938.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/sarab.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqj48bscuidgrpfqjhlgh07sn6/bexisu.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/mafirafotemuwazali.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6dfbf1fa0e5b09110afa29434bb1a438/32960752927.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/27021769402.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/maletutofuwovogulojalutaf.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_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 16832 bytes
SHA-256: ccccf5697a75ae72873be55809f11c3095d05c4286b8d819651de96b56590a3d
font_02_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10880 bytes
SHA-256: 855cdaef336ff2555c17d0578107e690f519dad81c83edb5424ccca9ad9c4776

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