Malicious PDF — malware analysis report

Static analysis result for SHA-256 810898247648b6d5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 07:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a82430625e51aa303c1267ff159c03e3 SHA-1: 344028d8fc54f17602b0a218b2ee7c35f658bc2c SHA-256: 810898247648b6d5e59e37bbd9c471c1edc7d2c99a85a96b3a09c7fca5fe0f13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate attempt to use SEO techniques for malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sydneystudytour.com/accounting/userfiles/file/10152278078.pdf In PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/guruz.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/momuv.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea2d8bb7c---zakizuronexojikinib.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/74477698889.pdfIn PDF document text
    • http://hanauhrova.cz/files/nijusufikiwotowoxawabafe.pdfIn PDF document text
    • https://go2germany.ru/files/file/xefopifisejilek.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/jigadasivavowanezisoreka.pdfIn PDF document text
    • http://keramann.ru/uploads/files/nikulag.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gevajagujiba.pdfIn PDF document text
    • http://12shio5.com/contents/files/bugosebakimor.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dewugux.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbu56dub390imon6f7vsfokmif/65010402825.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/88629614551.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/64002285005.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/vevigalorepipofisupumaref.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/pevodekawarufixojali.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/nozumiboteriweponidireked.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zegokaramiganoluxoxakinit.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/22649516241.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/26693263719.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/08b245a30ef8bddb27e0cb44ecbcb439/zozosonikunafejebojofiju.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/89499528463.pdfIn PDF document text
    • https://digireg.it/upload/zapegalab.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/livebekubezizixaluzaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pro+gym+workout+premium+apkPDF link annotation
    • 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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 20064 bytes
SHA-256: d885354d2f82ca7f203847a2d3352980c67808af5a0469e0a0a3991458b0e597
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 10672 bytes
SHA-256: f7e476fd53f8a3a3663756f664298b013445d9861ac7b6054aa0a1bf7226be50

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