Malicious PDF — malware analysis report

Static analysis result for SHA-256 760148d2158a4848…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 11:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f518eeca2de559139dd631da5bb4376b SHA-1: 0c6a4850f213fa49215bc30a909cb3d6d68410bf SHA-256: 760148d2158a4848c069fd9cfec39e40aca5f85e54cd896a50dc9ddc75ad5149
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF used as a lure, potentially for spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=f+sharp+scale+guitar
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/26676109185.pdf
    • http://limobebe.com/userfiles/files/xobunibekeviseveno.pdf
    • http://abwmechanicsville.com/uploads/files/sugepuludogi.pdf
    • http://misr-consult.com/userfiles/file/50291487911.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kabuza.pdf
    • http://imhkayseri.com/resimler/files/98275566043.pdf
    • http://biaikatolikus.hu/files/file/14397002380.pdf
    • http://kammatrans.com/userfiles/files/49400935070.pdf
    • http://koszyczarek.pl/userfiles/file/tegapufif.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/39318031703.pdf
    • http://studiotecnicomartani.eu/userfiles/files/46143655490.pdf
    • https://mollis.rs/files/673429928.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6l3ac7skf6d1ifg42qjgd0l2ju/99292051283.pdf
    • https://aynadakikemalizm.com/resimler/files/xufutiv.pdf
    • http://nickels.design/ckfinder/userfiles/files/52893105282.pdf
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/jaxigidajatupubodorujuji.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/42008989422.pdf
    • http://mywayrtk.org/userfiles/file/32180133744.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eea7e44a4---reberozexelupepuwikuvivug.pdf
    • https://hearing-outlet.com/uploads/files/202109151052578633.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lt5urnojn4et21enh4hivs7535/81200123071.pdf
    • http://divorcefinance.nl/uploads/file/35032692542.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 16792 bytes
font_01_sfnt_off0000f68f.bin
4586bbc46454bd79447c4ef214725c41506b266e0f1653ec0c29832761421c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 18048 bytes
font_02_sfnt_off000125d4.bin
bb5b35d5f3352ec90b1aacd26e67b6ff5c808e6d01168513f0cf1a04b93a057f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 10504 bytes

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