Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ad75757ac88184…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 05:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90f2d32e618910aacb06d060333245c8 SHA-1: 2823ff4ea73ff57534934f4b83e87d80073625af SHA-256: 46ad75757ac881847e2cb4cf385bb24152059340342c1f871952810da709ed97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains, 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 PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=east+of+eden+free+pdf+full+text PDF link annotation
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/lenivetivulufoxanuz.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/gefoxawexotumopife.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109051846188276.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/detikodobapodik.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb54bba497---55355442194.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908161002.pdfIn PDF document text
    • http://hodori247.com/uploads/files/71224210348.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/28a34c77197ceddf2fb0ce1fd9394c41/62920821548.pdfIn PDF document text
    • https://polytex.de/sites/default/files/46913841056.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a0f49263ddfa88276ceb31867694d763/83456922972.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/sudalatatemos.pdfIn PDF document text
    • http://bushurov.ru/images/files/gepes.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/sezagiroletugovanazobedeb.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/41196095550.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/25603532048.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/laviputibenigiv.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/86293218570.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/kitikefupixulimub.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b8c4966edf0657e7595d9e3d4f3a4e6b/tetisovafujusadufobojaxiv.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/204369082.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210911054814.pdfIn PDF document text
    • http://grimastone.ru/files/gunewefadinosadegedudaj.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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 18416 bytes
SHA-256: f1f15fed5aaddb567607863d7a29da6317c4a00c03c5aa169ae7431a0b5d044f
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10584 bytes
SHA-256: e85e4741ab2db1bf78e7051985bc216f012caff7a0685120dd47e8f05bf19547
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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