Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d66826805e6e3a3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 15:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ead9809ad3d73aa1b1dcc4e24283580 SHA-1: 27027ea1a3167fcc3935148fa127c561404dfd98 SHA-256: 6d66826805e6e3a3a6200f2f86ad4faf49f4579c977d0ae1dd7a9b0dc566516e
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. It includes numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/93061252565.pdf In PDF document text
    • http://santeh.md/img/files/saxonuvodem.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/jijubez.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/u27j770th6egdsm6mmquj93ho1/84169387908.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/6alh4ssaarplnsi7uaq30cr9qa/jubesafujixugonanapo.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/wiwoteba.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5ff3acc5---27800483670.pdfIn PDF document text
    • https://fishuntpesca.it/file/15784554374.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/17003513590.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/89033510063.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/740cc6863056b15761d2f863af4b6719/raxogefumuw.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b2865a73f46830eb2a7fabb3d2c1ba2f/31599350489.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dinavazawaziveraxeridu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7cf614173575adfb4b2cd2a4b55e5439/96482802080.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/budamebudatewekodabokij.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210603_025230.pdfIn PDF document text
    • http://108homed.com/userfiles/files/94324759070.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ec7dad08e23f495bd63d536cdcd107ba/xagiwufizewimemoja.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/27847663060.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/gazaluketuvorapini.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/41366239744.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a1846b6a203f66e1b6db0944ea5ef16e/30097027097.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/67023058062.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/58455702394.pdfIn PDF document text
    • http://ekomeg.pl/Upload/file/morulekuvofulaz.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/23693810012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=spelling+test+worksheets+for+year+4PDF 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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 17552 bytes
SHA-256: 3be1e7662079993a2cc60a2d8b1a3e481aac4bc45887620ef52733afc7c19fe9
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 11084 bytes
SHA-256: fced1daf2c6f15d0df85f18c834d5fd485d2336ffb57128808e0dbe901d54e5f

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