Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3975c4c9a83d33…

MALICIOUS

PDF

88.0 KB Created: 2021-08-10 03:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef79e841b281cde8918bf049f7546fa6 SHA-1: 2289a94e00c055990894d2b08b1afd740bb71a99 SHA-256: 7a3975c4c9a83d33ffba2ad54443860e10ec9c147ace96a513e2acbdd03a63e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://chcial.ru/uplcv?utm_term=como+imprimir+comprobante+de+pago+de+pension+issste PDF link annotation
    • https://aimara-bg.com/userfiles/file/zixefivadowepuvodorifu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/pibewowotuxosumopopirez.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11f587fd6a---fizolorofizunuru.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/de2619778534a8f3d829b96483029777/kuzanaxuxowek.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/7373903340.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/xinexedipobumasaxaje.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/xunemalevirotalasobevalo.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/zebegasabo.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/xenuxiwufuzufugi.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/vugojawenexagofa.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/puxonibonixu.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/34932774387.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe984cbe6---kurojevujetitadivataj.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/58050126673.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/53726562474.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100dde62d94a---98405604011.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/37935245210.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae415e693---daxak.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aeb657055af---6362125831.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/48694522805.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/22982511054.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/82804632530.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/lilenugeratefonamuza.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/wujaseta.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/fijaleritidabor.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/15df9ca557b80649720ca0d587a4671e/67500534516.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4811fe08838346e5558f1d69d7c4b568/muzufuzozolemubimak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 10980 bytes
SHA-256: 57064d7d147cdd9e5284a80b857aa501ca524830804ee55374a757fad5357781
font_01_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 18116 bytes
SHA-256: 684fcd2cfd6c02f951475901d174c206d0faa3ad059190cc3287841ffe3c3fa7
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_03_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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