Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f217bba8f117996…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 11:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 543c5545331b8f73b7962379fb330f3e SHA-1: b718b920d4da14cc7bc4ed23b5b12b6ab96b7eda SHA-256: 4f217bba8f117996855877eba44e30948e497545f0d2e6ce3779d54fc8a6e351
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious payload or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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.
  • 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://catamma.ru/uplcv?utm_term=360+passcode+reset PDF link annotation
    • https://franchisefarm.franchiseharbor.com/files/files/mizakoxojugexenoweziwipu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/24895275094.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144248c3b242---megegokowagepavudupo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca940978b0b228deae01363ca08fe5f1/37252068093.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/49812803958.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/79180380349.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff8b87114---nudutikepisakazomobiz.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wugoloronewutizezevuk.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/21c60256ca6a822d8fd8a8d3a4844fce/kobatawulogitaxaviki.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/99035123217.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210912084413.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/samunel.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/36188530252.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382abf916fe---misuzafubadukojolojopa.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110035e798---15800101481.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/51818982076.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65866859340.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/simibonijekikasasuvaxad.pdfIn PDF document text
    • http://pasaru.com/upload/files/poragisidopofa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143092263f31---32075466889.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/95318365563.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ba5f1dae---84906538818.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/52084388468.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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 15016 bytes
SHA-256: 4f7e8901cf1f6be5b6777e9ceedfcf5d408ee3748d8e8a4b9520d844991d73cb
font_02_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 10632 bytes
SHA-256: cc72fc25414a3918e1c608bd0f9acef4e1bc1c8493a59338251a301c5e05d759

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