Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06840f4afc15c0c…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 12:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f701feb8a91af8859ffadfbec0b01ac SHA-1: 4d0672eb428abf9b9859a9312282e090df15c8be SHA-256: a06840f4afc15c0c65c19e7526caecff25dfc3776705baeb7cc5f1b041c95424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/75511518066.pdf In PDF document text
    • http://nitecoreromania.ro/files/file/kemuzagavarujagubimuxe.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/48037103296.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9d9816b559b2b4c413f8b661e6ad7e11/72678077765.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/37100152454.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/jefafimemulezazeb.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070509fc2559---nuziruneleturomijurodakir.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tujaboxejeg.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/22460767756.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd276c7144---dodozobokolezegemupugeda.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/61352759647.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/mivobufekimusonizu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b3754c64a5c52342b4b5cdb71fd899dd/4700628851.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16086e58444c80---26412162946.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098300450213---fajenaxikexedarivepelo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/33181601973.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43cd63828---89882108573.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ae0b990d---nebogezi.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/dixepenumitufopeje.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gl1ibtje4t6jitdv7ud4gp8l01/lonimamamesesafevo.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/fifokekogaxewebimatetene.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/p0u340heig6301e1ks39qr3vi0/28332931892.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/xifijitufebikilipobavelew.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5a015439036b561f2e9e1b7c67fec09b/41390992644.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4ec32141---63752429861.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210805162847.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/98981600073.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6794f3ce5d---masavopomade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shimano+tourney+manualPDF 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_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 10492 bytes
SHA-256: a7d420d65a803a1ceb29bd5e6fc3dc4e7213184378a8d9e6c1a8e2a41ed457f8
font_02_sfnt_off00012b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 20000 bytes
SHA-256: 4756cd824dad9eee24861899eca97a521ce0e4399e7f3767b7f1fd4ca05ce113