Malicious PDF — malware analysis report

Static analysis result for SHA-256 92495523c6ac5107…

MALICIOUS

PDF

85.7 KB Created: 2021-08-30 23:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49a6e31beadd15c724c4d75bba76e6da SHA-1: fff1f31b3e6c764c4c29d19ac529914d0efed91f SHA-256: 92495523c6ac51075a0a6e39bbb71b63bab1db0834d130840c0671b38f96959c
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it's part of a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of external URIs and a 'download' button lure suggests an attempt to trick the user into downloading a payload. The document body is unreadable, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=monthly+salary+slip+format PDF link annotation
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0a3db21e6dc9c833a3808d27b6f73b4f/pulabevavawupavojoronidox.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/badizerafutijanaxutifipe.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/16185530477.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/43612666401.pdfIn PDF document text
    • http://kco.su/userfiles/file/bobadoxepabizavarodovapo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kebuforixuwemizarizu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/4713506017.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ivttdoi2hi3dh1kg3q3mdhns60/viduzovedetugizunaketi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/gegejenomewinuwesitujiwep.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d941cd5459---74734638374.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/713e26d7196a400e21ad43df89e5b01d/43093458592.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/21000887011.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/zenakeg.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef1413d8f---2738066137.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/vitaxipi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/78570883561.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853bd901a6---worakofofo.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/betojanak.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/21431451537.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/pituvanas.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8091587145be8c24135bfad4151dd530/25488660045.pdfIn PDF document text
    • http://hopsch.de/uploads/file/fepap.pdfIn PDF document text
    • http://prmakeup.com/Image/files/dojidalur.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/14d9a05b613bc0f516ef96c9d1f869d7/48395985505.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_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10600 bytes
SHA-256: 07627ce0d9db190644f7ce0a647d5bc4f87895a92d157e85cd961929e8c4e632
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 17344 bytes
SHA-256: 1ea073e82adb291360181338bd359bc8fa7b9622559c4c4c5b607b4d05d6049e

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