Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b265067b246b877…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 13:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4343929ec788c42922eb25cb185fc062 SHA-1: 32c49fc51ff46868a57d76c5164043aa089cd3ab SHA-256: 3b265067b246b87768a6f2bcaa5a54c7c880fc9a129c67a7da4ee2930af7eaa2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://longvu.vn/Images_upload/files/99177194346.pdf In PDF document text
    • https://gkatsov.com/userfiles/file/fivulipa.pdfIn PDF document text
    • http://citty.org/images/uploads/file/simamawaxuwedesive.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021915154815967.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e729db33d6---nisafutimi.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/22941248679.pdfIn PDF document text
    • http://eichler-kammerer.de/40231874859.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/jidefofi.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/57015575818.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/lovukidutu.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/10159767575.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/nafagitufeleki.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/47335329255.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153d7707dbc5---leziveguserurekapavuv.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/4262876654.pdfIn PDF document text
    • https://angkalaris.com/contents/files/46812503073.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/53652655681.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/woguxuwobavir.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/89771935118.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/69968220117.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/palazozufuze.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sa6a1l1omq3v902942p303t8p5/78637774843.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xateliwamipiverotimewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=first+person+dark+soulsPDF 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_off0000adf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 14844 bytes
SHA-256: 3fb8d1ff98c4f2a0495571613f35bb3e448465b82bddbb9e418e0d3131924191
font_02_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10556 bytes
SHA-256: 7462f354ee4a017fd498a8cf2e1b07951b1b3e2fcdb014c6fa8d9cd7e4a01eca

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