Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffa7ce44aa26774…

MALICIOUS

PDF

69.5 KB Created: 2021-09-21 20:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1be6d1ce3d60a81b4101eafd4a634de9 SHA-1: a12aef3fd085f831ed4eb5a9707e345de9d8d984 SHA-256: bffa7ce44aa26774c010aba6bc58d7948f553c386e9472440b1689b7b7d440a5
164 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of these elements indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8b0s98oph703du793aek88q6j5/7889434349.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb48c401f---kadarojetaredakupex.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/57589208144.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/55402178891.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/56758384792.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/pumezenozusoka.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/gubedubiviwejivapej.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/vedim.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/beteguran.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/vopasixijurufizun.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sinudijan.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/latizoxuwixik.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/mesetes.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/54328186265.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/fepekusiloraduzil.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/75560084142.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/83365266502.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/gaval.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144837574058---69365092464.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/nawedilemomadigataza.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/gadupufapina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+premium+games+free+downloadPDF 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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 15132 bytes
SHA-256: 51df4601fb4c7e274d53c3e95b3e0472dd28b95f7441b2fda4c7440754a81264
font_01_sfnt_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10912 bytes
SHA-256: c4e948ad38cc3b2ab7cfb2f8c9c6fa86686d8bd2f41be04a82e3ba0c79139b12
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1