Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef274e54a519205…

MALICIOUS

PDF

95.1 KB Created: 2021-10-07 05:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6f143fdc730fcbfb788fd304f43b410 SHA-1: 60b143f2c13022de09af08269d46df77e466ed14 SHA-256: 2ef274e54a519205a3665d33b6f4e704745333528045c96cfab8b9ab66954377
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external URLs and the 'link farm' heuristic strongly suggest the document's purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://studiorumeo.it/userfiles/files/22005656659.pdf In PDF document text
    • https://beautifulhairstore.com/upload/files/zedufadamewuzisokezapifa.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/febakefelidakalarobadi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/29727234325.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/90543429077.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vujepuxebu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ut0ll6ini2n1dl7r2a1medin3f/lerorimevegidefav.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/dubiwozigekipuxesa.pdfIn PDF document text
    • https://combrooncom.com/contents/files/dabigez.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af633b59d038a73737bc351a2e9391bc/34113373785.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/devewapexabibirejiwos.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/99969601703.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4b9312990ab60ddcf063ce5c63efc2ed/84619168325.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/zogudu.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/52801828236.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210903004659209467dc2yl.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e245f731d3---gilolexigiwijesudezis.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/3124958539.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/zulitum.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/bugubewegunode.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/luvesazotixovorob.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/26287407990.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/mudetixalamomoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=melodic+scale+patternPDF 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_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 19672 bytes
SHA-256: 9083ca2482884d0a01d7d0ac94e05d93a6f1ba3207cffb7e5a63b3aa1dfe5195
font_01_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156DB 10500 bytes
SHA-256: 8c1455dadc9a7316bcdbd45701329cf833041526cc001545bb4f5cede14add66

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