Malicious PDF — malware analysis report

Static analysis result for SHA-256 253025825c33321b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 01:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0bbc03e8f207dc1254fe32faa1f3946 SHA-1: 129abda4711749b3573504a4d1eb09cd3633023d SHA-256: 253025825c33321bd59b682029c15d313e77df3d50378237d00dd7a8bbca384f
164 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious intent, including external URI links and a link farm pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The presence of a 'download button' lure further supports a phishing attack pattern, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=photoshop+2014+crack PDF link annotation
    • https://groupburuemas2.com/contents/files/xudeg.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b050a3155---rogotafexusobi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/upljopca1u1ticaa7oae6h35m7/muxutuligalijesej.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/zamokobosozik.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/tasuwigixi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba1b0f2fc---dikezenanovibo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010538479140.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888eb176d8---wujeweniwisogakije.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/27075329602.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://floridagreatescape.com/media/file/85186376780.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/dasoziraneladol.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/80451229802.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36312784967.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210917061635.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/17815848367.pdfIn PDF document text
    • http://firegallery.ru/img/upload/xilovopawowagulonozovopav.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cecd07ca8---kakugakifuvavikusezuno.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/sewozolas.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/jojivesutaf.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/rimoliv.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1574e8cd2---92255975284.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/jelodotazom.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/wowewos.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/35788347718.pdfIn PDF document text
    • https://wonkingchina.com/d/files/21105221161.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_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 10564 bytes
SHA-256: 83074c20070078b0ac4f49f6727468d96117a62b6f6d143672263365660af27d
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 20184 bytes
SHA-256: cfea00e4c81ce5b3fa66260901a3ac431c72afa31abcc751c8867ed1609b4282
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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