Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1334bad7a67aa9a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 04:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f353a6cd8634f34d7c71a401de9e927 SHA-1: 781a0d6e74ee51d304165a7a79d2130dd7360d3d SHA-256: f1334bad7a67aa9af4f7b14728e8e7faef5e1ced784341ac0f65d7c9f217b3c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it is used to facilitate the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143005c47880---godepaw.pdf In PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/84652177146.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/negoxeziwutuziwuwiloli.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/3722736245.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/fanojajuxuni.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/70252087945.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/sifutudunugebuvi.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/7594300235.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/goranegojexuxeme.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161445267a088e---sepiwebukopemitawiko.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/36458576990.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/69367180705.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/12274819687.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/5237582990.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/16709231152.pdfIn PDF document text
    • http://airzo.net/userData/board/file/70429756753.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/87068784252.pdfIn PDF document text
    • http://storemisr.com/uploads/files/widuwemukunemuwerotew.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/42522113034.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4f027add01e7ac85d382cdbbe647d310/47950661065.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/baguf.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/wadalisejufexuxusir.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/63337420422.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/15093772290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fortnite+codes+for+skinsPDF 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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10332 bytes
SHA-256: 1bc7fb745f2f7660076aeccd93db2e61d760604f33815423416d55a2d3f7b49e
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 18264 bytes
SHA-256: 2db2ed116bda8aa45aeaf17074e734a9acc194d7a0c261ede99cc673ba6c0ac4
font_02_sfnt_off000125e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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