Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa33ae94a5952566…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d575df6aed7a911baf55fa76dc75ba33 SHA-1: d8fe1b74efe248ee6815224f86e805ba0b90550f SHA-256: aa33ae94a5952566526055c1377339c88da5212f3c08fe0b9028b34711a63e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to lure users to malicious sites. The presence of a link farm on disposable hosting further supports this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cuacuonanbinh.com/userfiles/file/dunamurunodezajufagu.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589dd5705b---tofexojukavom.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q7pkf4935sg9l7c8pfctjtbhp3/7341763258.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/digevogizad.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2878b6b3---ligaxotusow.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/636d461456338e2b28f37a068c7711aa/44884459193.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078443bd9491---31401766699.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/99764933491.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/jeluxifeduraze.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacadac72e---norobenimugikojij.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3f3536c8---66966159776.pdfIn PDF document text
    • http://metapolar.hu/tmp/xasupilopaputixewixog.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/gqucr79a8ema6kkaefmhbgk1pl/20045693866.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/65823555045.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3p67cj31k39agigs97c8skcrn6/31873930638.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/pigalavufuwi.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/6812415247.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/7678113350.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7980a6fd---15311543610.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/diluvapazufujemube.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/a3fmflgv3prv28svspisi8da6u/xebivaluge.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/1687628076.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/fo112rr87t6uscllapjmg51vtg/29319384066.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a7d8fedd---pafunedebej.pdfIn PDF document text
    • https://lemanssrl.it/file/kobudevafuwukejizobogasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=my+body+is+a+cage+darkPDF 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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 19072 bytes
SHA-256: 89ba22a0e91f6f1c8f7b670937ca47854b13720e7f8b729d1ffec823bad5a0c1
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 10636 bytes
SHA-256: 390356a9d0c899cddb4ebf531fb06efa8011be76298b13016268c5393e7ea7e9