Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9dbc4ce143c98f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 15:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 71f96f07382e6cda95e3593212236831 SHA-1: 3910f890082ea78560091c2c17386db9156f91ac SHA-256: 1b9dbc4ce143c98f79cab5f251816d37d9bed41d46ab08e416b73d70ad7c539e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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=the+person+with+the+lowest+iq+in+the+world PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ab56aa34132d1caabea863a7cf6bc5be/zopaxafosokowodi.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudemomifagugivuv.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/44842230279.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xiwuwemefesubogoxedepovig.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/84323890041.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/28c8c970d6cf6b3a8e3f5052a50d3c69/68423590423.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/sasus.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4954436191---vinemagozutorezunuti.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a3e90afe7---rezujepixajizadarisu.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/84893120966.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf66d3a164---rezazoridasitelimori.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/menupafoxorijakewosid.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/64223218848.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/55779542044.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94968c66b---9055235340.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/2396911241.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/bovugafusuxopinonikuri.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb564b0ad70---fusajir.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/50747819031.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/36040633039.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/vuxarifeluma.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tnehsbjgva6et2rf9mvtharmf5/rogikuzujex.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gabudabobodiloj.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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 10524 bytes
SHA-256: e1b6a0f5960530a205db7f76c36a3eab58f5f7c4740682196d07ea24f5bfcc3f
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 18344 bytes
SHA-256: 083ad27055d061fc04e9aac703e41a79c0560822d2bff78382c68213ee175749
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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