Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1bef01107acf95…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 08:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f382d2dbd5feaa6060277e2f6c07b9b5 SHA-1: 8f565d2fb2b6b7e46b102cf3a6affa3be891413e SHA-256: 9e1bef01107acf9590b122d2de53c9572a56376376acf8228bea165ae96b451a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads. The heuristic 'SE_ENABLE_LURE' suggests the document itself instructs the user to enable content, a common tactic for malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://crysiq.ru/uplcv?utm_term=top+10+ad+blocker+for+chrome PDF link annotation
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614018d30a468---14289866233.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/sipunebajafaruvotul.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/35199030105.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e079b355ea---niremedunafesuranawev.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/c41ue2v65eb725nt0tg70hh0bn/gikutuvekorizurawudeseru.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/30622890643.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kedafasibotorigadimo.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/vimefabawusaf.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/wogefemokivanit.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/xejimunuga.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c6f752fc4a09feafa3b7869664998365/gixikiligidazotirosa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c2abebea24fb2092ac9e9af62b80a618/pakixanufilixer.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/73536847792.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/16599964270.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/nuwirobalukar.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/68372030536.pdfIn PDF document text
    • http://inistor.com/ufiles/files/tifubo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0c375f41---kovanojabuxuzuxo.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/fazebixogekofawalaba.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/17540698331.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/sujawabu.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/sosixivogurujegob.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/96406521124.pdfIn PDF document text
    • http://cssh.es/img/file/97690755765.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/94136663317.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 10792 bytes
SHA-256: 13b5e715668a68cf9300839527ae1d97aea50ff3a5f63ff48a318d7b5f7ddf16
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 17324 bytes
SHA-256: 5f0c549f5c199cbae6ffe075d6eb405cd93d10c6c44f5d23c7686ec0ca81f56b
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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