Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2df80ec5fc9c8c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 05:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 308bad13990d437ce5986b23fdb68dd8 SHA-1: 9b801f7919a0aa5b2434e9665c60f0c7d142de4e SHA-256: ce2df80ec5fc9c8c5e0d2aaa954cdf7a0f5c911cda034321a5925f5853f4a5bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://goref.ru/files/file/26734012557.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142cdefbf5bb---siporaxesuzovovopelizu.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/47382866155.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/sigufadazarekodudejiv.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/52120916221.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/40279591240.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/75841969841.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/bolevagakitolumoduluwib.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/76945320684.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/30312448025.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/88736047842.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/41743881461.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ueeq96h5n44aldqqsfcg8qu726/fomat.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/12769263362.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afebae1f18---pijuvaneri.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/87690338067.pdfIn PDF document text
    • http://yuha.be/_files/file/28830083066.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/23222290013.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/sosiwativo.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kiradazulan.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b698980dee16fabb3f6c97bac7584654/wiwinosixazuxinosi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136587c11e22---woxubifo.pdfIn PDF document text
    • http://agavietnam.com/img/files/87963139437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wps+on+my+phonePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/72882863154.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_off0000b155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB155 10124 bytes
SHA-256: 93d096aee4e790c8f89bf2d1e2879e0b9db3cf548687790bd1401c6b74c879e9
font_01_sfnt_off0000c7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 15008 bytes
SHA-256: d7eb44f2a8b169847016813d2855f568a5d6ff4c5fbd22d52e37d63c021a8688
font_02_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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