Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9563643e34708fc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 16:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b37280221c33a1dba4556b91e51052b SHA-1: 057044aff7b2a9a99b78b62e55620fdfc6a9a4ef SHA-256: b9563643e34708fc87ab0440f02f2e081266c67036bea91f7d88d9c97cd2f289
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to potentially malicious content or phishing pages.

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://huntic.ru/uplcv?utm_term=watch+sword+art+online+alicization+part+2 PDF link annotation
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/26085905151.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/mumefafopipizanupamik.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-7/20210907065919367629.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133a67cce541---32655678908.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f2100a4deef10df9d3cdfbb17a8f30e1/poxejuzedag.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/2306648385.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xonawutezikexowododizape.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/948297271.pdfIn PDF document text
    • https://okazionche.com/files/wazuduzamo.pdfIn PDF document text
    • https://anup.bo/images/files/2318082809.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/pipaminumonikewiva.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/28695580930.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/mopesow.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/rixepuzav.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mitavakabevizanodifetut.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/48855301342.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/2882921187.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kekivovumenujopofukugu.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/19225723785.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/11335641750.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/95993178975.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ca82e42b---33218603241.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_off0000c71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 10868 bytes
SHA-256: 5a1c1207016585d0c96a8ccbd8d30dde1a196ce4d4b829480e84d17eb7c4042c
font_01_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 21524 bytes
SHA-256: 1f82eb903b979b8f8aeb293b83cbcb9912608fc31bf1b1906c1b86262ffd5c6e
font_02_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1