Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad3fed2525741a4…

MALICIOUS

PDF

77.9 KB Created: 2021-07-08 06:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32b53611113fa92c5be3be5f4f7adf3c SHA-1: f0b926e43c32ba7d60b9aa856fcdd2a00cb1cf55 SHA-256: cad3fed2525741a47aef8b53084a57f4561374c964fb9dd8f80099c81d8e866a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several embedded URLs point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://led7.ru/file/daxivofexin.pdf In PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f93d17b1b201f466fced22d4a5c4f98e/gotedulumeroxukolujukuze.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/350bdd9e0dcce11b36d613ee30acbbe5/60689317006.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b270d46f4d---66365307266.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec528c330d---68793803116.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/47171763716.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/18746152335.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160800bedb6a10---segopidofoleterawabamugus.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4db596c716---wameganomoluvidifipef.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d7afc52ae40a58777d851db1f1d62919/posulojowexe.pdfIn PDF document text
    • https://campermagazine.tv/public/file/vewefakejelej.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4eo92pksefovepeed03hg8aiq1/96107973770.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7ec29089ac4c26ea483c84f81af657c8/5420183507.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/87dbf390b2288e0382970f72ea30464a/9333048204.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a008d1ed464---96401832442.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3e655a6411b897a53e28fd918fbf4409/farawexapivelufukupex.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/98174104977.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/15f62f58e80a1a223fa76e97656fdff3/pavidu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e5c10a5f00ace9cae3a3c99efd722500/78887105682.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/24e4e880a9d6ee85a676a79842e7b52d/29625672502.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/q4iggh0gmg8shu9eccjcjig1j7/doxegafesitufemu.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/zurawanexejililotewirenil.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ec30c4e2144f8d0db0cd0a2a7fd25c41/83262687626.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/supijagelumogepasalopome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=verb+to+be+and+to+have+exercisesPDF 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_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 10696 bytes
SHA-256: a7fd23959aacc54c96d2e0dd2ae96a9cf5510967853ab3c2d830cc6f84f25424
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 16912 bytes
SHA-256: 3381ba9600c38d85e152fb9cac037cb5f947b70819e1985cc63da064eb2c9815
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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