Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e4f07c1a95a5c4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 11:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5879bbebfc409a30f8974b94dd19dd80 SHA-1: d9674c7925f951adea7642991416678e4febaf2f SHA-256: b0e4f07c1a95a5c4421d47ce69f2747a3efa0815b5ff863678c9f5fac4fb4743
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains heuristics indicating it is a link farm and impersonates cloud document services to lure users. It also instructs the user to enable macros or editing, a common technique for malware droppers. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://indel.sk/userfiles/file/mijolomep.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf8f7277980adf7e4a46f88efb1a3d6d/gurulipasegulovazatapeg.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6bea7fe26c5eb88e189c7ce09560190e/47505836695.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1enopo5hmhu6e6qk1rjs018foa/ditisuwikesanunog.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210609072105.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a41bc9b404b---povorabu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/ledija.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13932751930.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/78193439514.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/zezagili.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/duwubexuzidodaforulaj.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/5d8530e777802622737db93bebe0e4ea/24581779350.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd380833466---fifelijiremizuzemuzipeka.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4248ac384375c1a9cf3e5a1bc7b63b4d/90480451699.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210809_010701.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b362d350b8e---1766606894.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/18469287333.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f876e36b7406892a94ac7ae54077f2af/67335917310.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/v3471ksj6jmsmla0p2hj60ps03/disoweg.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/davizebezojanefar.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/76868416724.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/levesovazabaruxeze.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bgjc9rr7he7dsfgg6kvgj4c5tl/taxofewogumaxevagurixo.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/64532378343.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dofaxoduwarutitidiramegex.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a556f5fb98aba81c5f741e601e1b772/3809279649.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/nonutunuwozudivofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=edit+pdf+foxit+readerPDF 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_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 18616 bytes
SHA-256: 2bc07c09fa99d4a5b0194741fb60f71ccba02fc07d96e4b656d1e689aebe7c3a
font_01_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 10256 bytes
SHA-256: 1f3d83cf04361a9efa71b7d2d80f85744db4d966cadfbf5b6f3f4f6a357acb7f
font_02_sfnt_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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