Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcbf52b1d53c2e5…

MALICIOUS

PDF

83.6 KB Created: 2021-08-18 21:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9d3fa38b66c393ae26cd8590671b910a SHA-1: cfdf3f55d6a0fd31102ff2647d4130ab880b2231 SHA-256: bfcbf52b1d53c2e595a839305c6c16bddd1656b6f51ab5606b1f8e682ea5a38e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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 http://www.moyekolodin.com/files/zepefezubigiju.pdf In PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/valilutaxesivaz.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/85512762677.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/46275145769.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86c546289---pagimutotexodomokor.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609876ca88e5c---75401564404.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/furel.pdfIn PDF document text
    • https://aashianarealty.com/file/todez.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad45242b6---22453717203.pdfIn PDF document text
    • http://qdjshg.com/files/file/10963085826.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d372d04ca78---49578551461.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bekikigefoxululunisaze.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e538074e5361dfa95a90457b15547737/59886869868.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/tepupelaxorunuxu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607755afe27dc---kixuruderonarotuba.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/gjv1qvg6a8r4r41rg4e1og1a6a/17573110511.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/roxufabasobuj.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94fd8ad5d---18631553648.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/guragodazeweg.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fawaposijepidutezigikip.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/16825249656.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/putigafodugofopuvevite.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/30214518384.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/848936149b84af076050a3403ad0bc9e/natenuxopaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=iphone+11+start+guidePDF 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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 16768 bytes
SHA-256: eb2fec47db3d401383cd9c83d636f90bee6946b3ac283dd88e35d2aecf9bbfb1
font_01_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 10728 bytes
SHA-256: df957edbc75918327a98830517e6ac55367523463dec9ed5e6ac5d4108075021
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1