Malicious PDF — malware analysis report

Static analysis result for SHA-256 39147533c340ffe2…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 02:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b5e72999cd94c3214fae82d4ae7f607b SHA-1: bb9eb7102b397bb0d52c1fa90b2d38ce3e679a0a SHA-256: 39147533c340ffe20cf0d05a3b69de356a5e7efe08b187f40a30aecc2b69874e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=the+alice+network+book+club+questions PDF link annotation
    • https://fablab808.com/nbloom/fckuploads/file/97238527669.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tuxejalopik.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/xupezadetexafovajimeg.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/56761109520.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/14824514101.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/rebebudebadagoku.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1ri4tj35m66sn166tbftj3990r/73789378704.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d91c82513---75712131651.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/sitejesatitav.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/suwosidulezafugi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6d99ed29---9929009048.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/512fa0a758585c5f0df659a0ffe03d58/2275087852.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/20636656843.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c2b154f367df786669d9831938c18516/dagiwiromomulefedumibowep.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/movorefopitizamasunorega.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb4e01c5d---61536916492.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608729729f619---powikuk.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jalobekovosapata.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sta5c56jjh5dotovh2u2il4rq5/zususixegiwaforu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tia00ojlf6guj3d21t7rhubu0u/60566843491.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5f3b164248cbc588576bbf930417b550/92887993579.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/gobokedonifazeno.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/26658010024.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5drq3ioj5i0tkg68gr0sf66r37/lawurulufirol.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3ab89b2fae598b0c7a87caa2ddb7f90e/85549546056.pdfIn PDF document text
    • 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_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17608 bytes
SHA-256: 694177ab21b1bc1b452bf6ec1532349a527cbe17387245fce79bf6a34d239dfb
font_01_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 10852 bytes
SHA-256: e1babaec9b58ab905efd77c45ed12ec4492c4a7619a7539dc1854e4a422c5bd7

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