Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a3fb0119f27478…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 23:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dcd44137ff368764a7be8c953e996bd SHA-1: dd971104e26313d2cd3f3ef07eea2b9cc7f07b46 SHA-256: e8a3fb0119f274785025dcd26d7e56628bf4ad163acead28c4aad8233399f0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, some pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The embedded links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://d-innovation.com/upload/files/87536178118.pdf In PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49501783640.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161351e8551e59---nurotu.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/gifomaj.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/zujumuzimegujo.pdfIn PDF document text
    • http://chongros.com/userData/board/file/somabowekin.pdfIn PDF document text
    • http://saydersan.com/firma/files/14063579370.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gitubogeferizuguta.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7905ec52c---rogunefosikofajo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/fimama.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/60901202508.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/86019638533.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/zixaxunujijavuzifonu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/ziniwaxivanuxowajizekulow.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/81817367749.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16148c092ea4fc---musozuputomifuna.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/givipelasusizefikeguri.pdfIn PDF document text
    • http://precisao.org/files/files/tidevijanizuronex.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xuxodakazozujagurefutuwe.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/41715148726.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/95875906184.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/58347629376.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133a84f5d6af---nowamefage.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161496da6e9897---tepamijodidarisakomaket.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/33042940952.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jruft6ecb9ln7l8fmeqq11vm1/55615543778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+panda+mod+apkPDF 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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 10144 bytes
SHA-256: af036f6ab0f86721f77498417edac813102a08e99d65f5b9f5e5a95bb39af31f
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 20084 bytes
SHA-256: 205b0aa2a58017899c6e4c7917e2a68f3acf27f6ac93a968d7a57bc7db92e450