Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b674d2616f0ea9…

MALICIOUS

PDF

78.8 KB Created: 2021-08-08 20:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db78d65ae9d3f7034d5a26319bb94b91 SHA-1: cbda2765223339bb9b7cd4657b9584f65684e9be SHA-256: 87b674d2616f0ea90e3ea5177fbfc3c077ddba966368234e4f2bfcfc08563129
192 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on compromised WordPress sites. The heuristics indicate the document impersonates cloud services and uses download lures, suggesting an attempt to trick the user into downloading a malicious payload. The embedded JavaScript likely facilitates the download and execution of this payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=microsoft+office+2013+free+download+for+windows+10+32+bit+with+crack PDF link annotation
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a803c85c9efb34fbb469e5e281bc91c7/25846778707.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/51356382626.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/sutaxeruxi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/11600977166.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/69977160436.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/044d84a75344057698b6952291597f80/95245734749.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21f475bd3---soserabo.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/24190060769.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/45458538479.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/zolozazibubijagusajeratag.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/pafibatamapuxuki.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773386b9f4c---91786665649.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/forilu.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/mideno.pdfIn PDF document text
    • https://clinicscrm.com/img/files/porumunenenat.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/90858171294.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/84497637136.pdfIn PDF document text
    • http://banquat.com/userfiles/files/popir.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160825561d3a48---10684077893.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/luwedatixijigusovuga.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/saninomisifa.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/57202410883.pdfIn PDF document text
    • http://allycatering.com/userfiles/sikujuduf.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_off0000cd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 11348 bytes
SHA-256: a37816de1705b7a19ac21f3f5127b6780b50f0ff0bd9f3b86e833881bdf69382
font_01_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 17284 bytes
SHA-256: 3b8bcb0ce8597f7c1dce6e1ae80c0c353ac811074688db6157ac137dd5e78396
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.