Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cd841f4e95a200…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 04:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03cb8bee2052c3a615c35184b35f19f4 SHA-1: b41a057def611b69bf816684fd9a3ada6471bf24 SHA-256: 36cd841f4e95a200e8d2a97d1feda687768df63fa912bf3c9ffcd5ed8f24eff6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a link farm pointing to multiple compromised CMS upload directories. The heuristics indicate a phishing attempt using a link farm on disposable hosting, likely to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://fine-cottage.ru/userfiles/file/fatogomaxugowaba.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc82911a2---vimani.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedd29419c---gines.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/vakizamiwujilulaluvimewum.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/5801121203.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/57091418172.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xilodivekexebo.pdfIn PDF document text
    • https://digireg.org/upload/xogujulabokewalexotejodur.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109121502173311.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gusewobulivinufa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce75dc06e---farusazigibadunez.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/jomofuzefanoxewaxutamef.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/ripoguwexumebedu.pdfIn PDF document text
    • http://freetds.net/userfiles/file/75192604927.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/48572155319.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318cc3d2391---fukexugo.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/29476482828.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909120900.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/kabolilevomamepu.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/mukigemejowejotej.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/34894616894.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/tivilenuvanar.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/wevibafi.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/gavezo.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/98562076651.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/gajovoduxisero.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/3631505680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=master+kg+jerusalem+mp3+downloadPDF 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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 17088 bytes
SHA-256: c97751f81fa9566b8c9b02a041aabdf5dc71cc426ac65698db1cde81ba9c6d50
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 11216 bytes
SHA-256: 333edd9b42eb081d521bc9e3dc7fd3b12ec25fdbccf80dd699d8b083f7030e66
font_02_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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