Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff340836f164387e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 13:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8497b79440a1017219a595ee0965330 SHA-1: 48e336056dfa95f2874626e7292990e5e4bdc558 SHA-256: ff340836f164387e6fed55a0d820e85e71f5a5ffa4bf9fae2d1ae6f7f9911e30
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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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 https://drafthe.ru/uplcv?utm_term=clubhouse+app+for+android PDF link annotation
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/87240629268.pdfIn PDF document text
    • http://progetec.org/userfiles/files/vofobetopomafuta.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47f8a4305---98484333208.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/70351125624.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/5870909158.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/walurugekupunisasi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146755004c08---83500577468.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/56555797428.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/7952677550.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/zuvovaruxovosijasu.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/sofinagudap.pdfIn PDF document text
    • https://turbooto.vn/upload/files/kedabavidubevapizoforugoz.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///bawafemajepajelidovuw.pdfIn PDF document text
    • http://meta-min.com/files/10432785941.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/67103478704.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/22076922970.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/98236570795.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0a169a339882ea3790ab732e32f51be3/23450231917.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631087642.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/felalisopib.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/fapemusavenoxasaziwonep.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/wozepuwavanawipopuju.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/37359602491.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/kediboziwudemediletorudoz.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/matirixabiruloguxe.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/pelewokodalalulegeralen.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_off0000b4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 15188 bytes
SHA-256: 5f1e25398baeb9de00d696a7d53fa8080e4c87a62fb20bd4ccba21804823da9d
font_01_sfnt_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10768 bytes
SHA-256: 677bb396e4e2ccefe58f72adbb0dcc7ba22fe75c3ad32d691ec13d83bf0f8a48
font_02_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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