Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b101657522c31c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-23 07:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a8b992983cb579e063dfeae77fba5c5 SHA-1: 605b119633c2b13c24b73d403d6674e68367cee4 SHA-256: 88b101657522c31c5ad52599506d90704cc0702bb6ddb2cf0dd69901ca76c9e8
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 disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple external links and the 'link farm' heuristic point to a common tactic for distributing malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=maple+player+android PDF link annotation
    • http://graphicyazd.com/ckfinder/userfiles/files/83158891560.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/zusobisogapumodedibafaxi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/39375191291.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/86690148701.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8275ade71565ab687457d5227479a0d1/movuzexeveraxegej.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/33114653465.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/88410022078.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/51515750228.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bikudonorevim.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210912_56A6FC71CAF4F485.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7a4391cb---firogitagikogebawidolepil.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/dokovirusik.pdfIn PDF document text
    • https://gdaniec.com/upload/files/65839158268.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a197172d1---5678719778.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/jarukalitatovizetaxixuvi.pdfIn PDF document text
    • https://razredna-nastava.net/files/nuzajebivines.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-14/images/files/35712991359.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/71147949867.pdfIn PDF document text
    • http://nincity.de/inline/file/posipavorefujaro.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/93351683918.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zosomovolifuje.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba1c9be7---39722026687.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75d1816b6---buwiba.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gukob.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/44392373472.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/97392147252.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/surepogararuvos.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_off0000b35a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 16792 bytes
font_01_sfnt_off0000cb71.bin
a1b1c616f876c4f69ff6e3fef8477c35787d24215bfe239364ebd48faac0bd1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 10224 bytes
font_02_sfnt_off0000e26e.bin
54ed235882c56c2d81350376c55ec4c5828787952cfdedecc613c88796fad5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 14392 bytes

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