Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3798aeab3a0a51…

MALICIOUS

PDF

92.0 KB Created: 2021-09-24 06:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36cb7d7eaac68e49a239a419a548d2a4 SHA-1: 677e7526d59e2d34ecfe574b486a834fa784da2b SHA-256: ca3798aeab3a0a51253c014548f7d792624e44d67f22e08c494d8261e2c318c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content. The presence of external URI findings and the link farm nature suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdd0728c1---77847140358.pdf In PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/jovif.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/31444028150.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/46557636354.pdfIn PDF document text
    • http://momsystem.ru/public/file/1361580863.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/576434484.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b204c29d---85585104901.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/30782907255.pdfIn PDF document text
    • http://moneymaker-gold.de/files/miduxeletoloj.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/81267202703.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rogoxejow.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/76347642627.pdfIn PDF document text
    • http://kolesa.sk/files/jiravo.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/96806488565.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/zimekadokem.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sumibawuzobiwamov.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/pebabidigaxaluketov.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/6246839647.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/nemosa.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/64229240152.pdfIn PDF document text
    • https://semut73.com/contents/files/68636792901.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/54697938329.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/25197293879.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zemukow.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16141da2c59d4d---54260818123.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d69a4449---520583795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+art+of+fallout+4+pdf+freePDF 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_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 18276 bytes
SHA-256: 4c57ac271540ecb7ef4385426434c47904b9106e00b6333cde18e4201c28a65f
font_01_sfnt_off00013262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A79 10372 bytes
SHA-256: 715abc44e5f1b5ac31631971e237f9c557c5895b7efd4ae76aa19de6bd3ecb7c