Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e6380d1864af7d…

MALICIOUS

PDF

96.3 KB Created: 2021-09-06 00:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 164363927cb8b6ab2def1a0ff1390658 SHA-1: 5d8663939bb78fce6a1155f013b257b9dd3a16ec SHA-256: 90e6380d1864af7daca84abeadf1ba55da08d51584357e50ce46e78c8f7899b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious phishing content. It includes numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious infrastructure. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3b02dbc4eb46e0220bd4ee6d0640710d/78887630626.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9b0b8d404---4005036752.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/dagotefowozozub.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/tazelivurudubufoxum.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0ced80ba2---20711297411.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/12920740689.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/babemozorobur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8446af5f6---jexaf.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fudexegegoj.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/zotemuzebuzibo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f231f494dd4e9f09453510070cd8642e/20241267390.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mitlm97qikbnmm4m5bgjcs24ph/pefomafebiruka.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d3b95f84---sukapiberadodaxivomivaz.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/jejofesazafekapivukolexeg.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076914e2e5c6---xuvigekigiguz.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb8334b415---19267246172.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/gogabexozegufi.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • http://willbramephotography.com/kaxudogavaw.pdfIn PDF document text
    • http://labonscafe.com/userfiles/garalelex.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/408c3cf6dc7ce1081778ddf6130a8863/96466478228.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5817559f36cf19d5a65bde32cb4aebdd/bibutituwuto.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2825236325.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/40381660019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=datasheet+pdf+4017PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 10436 bytes
SHA-256: 486b4e888350259ac9c31022bb5c9992a322392871a86191f0d50eddd6b20e8a
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 19828 bytes
SHA-256: 71b738c698dfcb3d72cfc0a18fc0b978bd3075c77866e9042eba9e2a7c097158
font_03_sfnt_off00015b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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