Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc1b17413e29486…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 04:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d569490e9bcb71b0afd304c51d251f64 SHA-1: ef3aa70995f814501e55847a98d8e5cf701c7fca SHA-256: 9cc1b17413e29486c7c2b99565bce522d65c7e6ceb74b41a9b3da3565b919eee
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://sanagustin.cl/files/zefojukor.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608616feb1043---sunezu.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/fituxivapezu.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/mezedurodeseb.pdfIn PDF document text
    • https://aildf.in/userfiles/file/maxarolisixutizu.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/tolinirazikizaxoza.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-25/20210725200148950386.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/67152730977.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/nosunorofodoxepanawefofoz.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/fenolilonezuzoxixuzigarin.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/no2jr88qqb99mj8kqg7gvpdqp9/78424958387.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/7037731329.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210819_98B108E9B42D572E.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/60m34er5j7n53k0gbf2h1g0911/tufozirosepuze.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/relulogefitowonixuxoxapa.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/lojasidevexono.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/98944209812.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/bipom.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/4737732341.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/majemopeko.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cb1c7d7b---2332722145.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/ninoremigabugof.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/pugilituluwupumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=out+there+piano+sheet+music+pdfPDF 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_off0000b6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CA 16064 bytes
SHA-256: 040a22c67b1849ea9ef854816eb60165f1261aff35c510c2f795427cc34fb841
font_01_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10964 bytes
SHA-256: 6babbda599421286b3ec5dde076d7df8381192ceeabafe91db3c545b04018fa7