Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5ad18a2f82bbf2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 06:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1733f19ecbe9afa07c1aa9beca325bef SHA-1: c113adbb59fb184a833e4e39e533d77148662501 SHA-256: 5a5ad18a2f82bbf241033a528f45bc5901feed92d62334ae8c56d774c2cc4764
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are typical of a PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://oniceh.ru/uplcv?utm_term=formula+for+asymptotes+of+hyperbola PDF link annotation
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5b271c10335e25208a824fd8915ffaf0/52701596391.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612df1f392beb---borufok.pdfIn PDF document text
    • http://klpa.net/userData/board/file/gisakiwi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607647b329f9d---jujanoradotexel.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ca47f5cd---48030243714.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/94670667745.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/26957858216.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bca05fb0b42---gikiwomimurexon.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/xurotepu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/labugepemojuxomaloxabemup.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/fapudabomavafagurux.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef5d552c2---perewevepatu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/57471482653.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/vozamoju.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-19/images/files/kelerinasebadisabamomor.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/gegefejobefon.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890a8631360---siwalofomub.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cb805da07e7---tenabetubatatokifemeje.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/17924222182.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/xefokafebaxopu.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/d708dbcc188b7331d01b7bcd907275c7/65900410976.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/12562002182.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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 17556 bytes
SHA-256: c0675cb58c7badee4bdc84967f66773e134c0380485378617296951e4e4cb41e
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10756 bytes
SHA-256: 3d16eb551f9bc2bd84bf65f225cdba9fae9ad9d20c61811ee321748cb994eb81

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