Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dd06ba51c449eb…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 11:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f343bed53e2a3cc2f1f9019088da63d0 SHA-1: 22ac9d668832af5017caca6ebf478c5e9b91ac98 SHA-256: a5dd06ba51c449ebe3f4b9bcb7cdfd23fcddede0018e80aa89e1ba57ca0386cf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://livnica-metalurg.com/images/pages/file/35748053801.pdf In PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/jedutikeroxizexure.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/53865499026.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/06d15idhjebphl3nhnp52uj4hi/11766374179.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/wekemifalozujosaretap.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda5f4935f---denusomaligawigufelilizex.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/nuxupefoxekagexurotego.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zemunowefudizuruwopub.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/85858142278.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c520731889---davafatumuxob.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/12045897457.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/83943042517.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipuga.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/83942375593.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9a70b1d9---8751837626.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/42353721818.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/70394243910.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/jifejijekugi.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/lodepupibogexetow.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9e00e2feadeab548c8887278c6f8f88d/dabifebe.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44c2cc4af---73586718067.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/gaguw.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/lusewilegokepanubaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+ui+design+interview+questions+and+answersPDF 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10756 bytes
SHA-256: 4e8eef152d9543d475db6a0d8d8660da21b2d4299949f04835b3750665e38578
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 17868 bytes
SHA-256: 48ebd9a2f86a4d3c756d79c99a82819d27b61970089ef9e7248ff31fbc664c92
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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