Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b1a4b829fd1ca1…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 20:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2182a3acb35cb36873e1e548d3689771 SHA-1: dff8987beee14e2f9a0b0a9ae441dd054edacb4e SHA-256: 57b1a4b829fd1ca10d23bd144d0ead74b9f62ce73e6f5047eb17a5870b16c1d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6385

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=menambah+bahasa+indonesia+di+android PDF link annotation
    • https://ketdoanbus.com/webroot/img/files/befukomokir.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/riwobetamip.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/puzukuxiratavabo.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/zefev.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/96121247851.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/xunusedafufuxunupat.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/fokazovugekepojerawi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8745957e---pigijotuwizikebixifuzije.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/buroneserubapawaj.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/mepatibugimusaxezewu.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/1276209071.pdfIn PDF document text
    • http://hidramaco.com/files/files/96973031796.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/namararasibile.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/56668414923.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/59546661074.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/pozapes.pdfIn PDF document text
    • https://diphong.com/uploads/sabozikopifojesamudu.pdfIn PDF document text
    • https://renault-service.com/userfiles/96770705923.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2f84541edf93485f47eb45e3daf8a7b0/didimoxogalam.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/dinigufeze.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/dadilipusajeniwo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615099a2dcd24---jewekodunefomape.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/rajaxili.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 10504 bytes
SHA-256: 396405ad57fdf59f519886cbe5cfcfd28aec07e79349ec1e547099318f6d425f
font_01_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 16688 bytes
SHA-256: 10270cd6aacc92e423a0c5cf55ef8fb14009692bde02b517c7e748ddbf79f1c7

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