Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e99366576431b3c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-07 17:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14278a34a3da83f8c3d74eb67c81a368 SHA-1: 352b05975355c6986414ea7dd720420b793a3fd4 SHA-256: 5e99366576431b3c708bc8a56b21e54b96f68fb9f6bb6f5216be24401db163b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate the PDF acts as a link farm pointing to compromised websites, likely to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for downloading and executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a615f87e039---kofuweduwop.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160dbde97715f9---11633693616.pdfIn PDF document text
    • http://aps-mes.com/files/file/kapolataguxinijuwofemed.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/08d8b52c92fde734f169ebdd427cb20b/gefuduburavodiro.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705ae4a915d---6592439156.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/6dc8835d7b28bae5127743c08f259856/38324675236.pdfIn PDF document text
    • http://merwepizza.com/upload/file/67507116609.pdfIn PDF document text
    • http://innotack.com/userfiles/files/15231578237.pdfIn PDF document text
    • http://imi.vc/upload/files/monibonezigorajabazad.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/vewugow.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/vibibuduwa.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/39393651931.pdfIn PDF document text
    • https://ancoraeducacion.com/images/64730129786.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/59624627983.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/wadadebofujovufiputavora.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/39ac291f7a69d354a2d524fc6d699fde/gemesu.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/61970803267.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/noxixijabezerisapavafum.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wikibewutowuzop.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/44885865529.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed832008d7---sudog.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/22020621888.pdfIn PDF document text
    • http://labsshop.com/d/files/6523410941.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomuzesilixuxak.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/14lrvqc779pl3ovp3etg93lg6s/6094233172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=soccer+goalkeeping+drills+pdfPDF 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_off0000b702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 10864 bytes
SHA-256: 3ddb3baebffb561c30317940457f5aee943d4080cce51f7e90a5bf4442579da7
font_01_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 15576 bytes
SHA-256: 7ef1c486ad54f4bb1be4e9958769e6a43f6441af5cce430794e59995b00e03c9