Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b20b7c5a997bcd5…

MALICIOUS

PDF

96.0 KB Created: 2021-09-03 00:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71541e3baf305a4a7e9e2471462e01e7 SHA-1: 42d480d76283b3d253d996f7345107d07c569c17 SHA-256: 8b20b7c5a997bcd51c4c3120656159ed684686011e875b3a59cc1c0ffe67fc9f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary function appears to be redirecting users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8d0a56db177c8a627b0d4af59144e790/nezanovozesudubokexewet.pdf In PDF document text
    • https://virtualpulse.eu/UserFiles/file/47481972653.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/52655254855.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/98767157261.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gopubimivifoginotadawin.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/32d7f543eb37f7024c5f5e23589d0eca/pidobe.pdfIn PDF document text
    • http://landpas.pl/upload/file/gegulafogoxanoweruvugo.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/kemixetinanupilalexuma.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d68280ee73d577cd845569efc8ce7c17/duxuve.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/22392883304.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/52fc1b8becfbd9d1453b1d465c85498c/nadinegalenes.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/c2fpqu2q8laoe03ru9vkufoo1a/sotilurabexeki.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/milipofopofikemawajof.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4ec1617996903a736f0febe7ddf9f2d1/65518445042.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/93626470541.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/bobapa.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b28ee839e916938c9ed5acb7b9332112/lugosonufegelalusikasov.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2213d5db0a---22882987165.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335b8250b8---60445653508.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/munojigidegejisugojel.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c41da9c01---zuwutomupibiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cours+electrotechnique+fondamentale+1+pdfPDF 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_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 20380 bytes
SHA-256: d5d2b451bd77c668a52363345a5694665878f5bd2eca0fef3208f531175682be
font_01_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 11212 bytes
SHA-256: 6553b96ee0605ea6562ac518a83984e79e80b43bc80eefa9667bc7fa988e7e40
font_02_sfnt_off000157fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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