Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b10bbe60047424…

MALICIOUS

PDF

97.3 KB Created: 2021-07-01 14:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c4d65daa114d4b00666bf9623332e0d7 SHA-1: bfdfc66b6aa71e17efd0d06dc7800f192996a0d1 SHA-256: a9b10bbe60047424b2a4076595b3ab503602eb43e21faa68c8006ac757f5c2aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a12cc5634d4---dasivisetijokufaxikav.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86e7e4427---wegodigafepe.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/vavogajabukarurokesitele.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f8418708ac338fc8a63ce0bfad56f408/lodesabexevikonuxadiles.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b0b43147---lifivivoso.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/82671388684.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/mebuwutobeporogojafuj.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0de44426f---68592556661.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nobinulepejimubekesiduzit.pdfIn PDF document text
    • http://avistravel.ro/userfiles/file/waxavitukaluwi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/pidejitopalirasugefis.pdfIn PDF document text
    • http://aplus.to/userfiles/file/26092799923.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/60d9c85457d6b89290d1cd229677a871/vopulorepowew.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/belogorafapoxegaja.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eb8a31d79---44572563047.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/34286937088.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b1399d671---69492844952.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/givusotejosujobogudip.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0f081652---sevubamutuzaxerewufa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4b995dff---21657504029.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e62dc27b47479183a294dfbf943c4e12/takiwemonagugisemom.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/rodupogowilopagam.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1f93d3ae---63448468482.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/cidtfq7736d3vuum7o994i1dah/fesosokixoborefasululi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e44ccee43dce4b9e8732cbc47bd01db4/winogezene.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/41015130472.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/dojavixekuziti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=neutral+colors+quotesPDF 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_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16784 bytes
SHA-256: f8cc2c63ba288f3d4cfa22811e1b9fc3603aee1a14de7d74e38dcef3eb7f6403
font_01_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 10248 bytes
SHA-256: ece6c35f8794af2ba39254d42aef49969dfafda924ddde1ef3fbb16a6416d28d
font_02_sfnt_off00015ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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