Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f631597bd412cf…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 05:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 040e7c0d0ad8d5e6ae2c869e4154830f SHA-1: eae7e52fbada4adf95806de86bd00eab24761152 SHA-256: b7f631597bd412cf02dfc72afd806759797a7ff456bdf3fdf1fbe70e10727377
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=can+i+download+apps+on+my+sd+card PDF link annotation
    • http://abwingssuffolk1.com/uploads/files/sisov.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ed78d17a641438e24974961ef497d384/xuxezejutup.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4e7bd211---lefotatikawurufurinolotap.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/nonepuworobiriwu.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/99938846264.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5c0dbb98---valuri.pdfIn PDF document text
    • https://umartravel.com/files/sexuwarezogi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/watoxezajejitunixosiza.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/jiporulobutapuz.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/diwiwuf.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/tejatogiwuxemulotak.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/rimamabajobapori.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/34341485347.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/80140952253.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339d521a409---16504292491.pdfIn PDF document text
    • http://thongthien.vn/upload/files/80793284387.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zolejo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/538cca24f25ad74c4e21b9d39369beff/gaperizedukoro.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/mivirirewanovubu.pdfIn PDF document text
    • http://sooclose.eu/upload/File/wapuxilof.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/avidpp4eaa4s8o0n0st1thu616/godifusivukibimejukovoneg.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/18938443767.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_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 10676 bytes
SHA-256: 27cf52b755731417b49e260b3a0baa4abb8747b4f43ca3acf6807457bd0cedbc
font_01_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 16944 bytes
SHA-256: a81f43f8f9c0489fdf72c76dd48e0b5ac13ba4a7a6ae22285f0ead0e2d0116c1
font_02_sfnt_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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