Malicious PDF — malware analysis report

Static analysis result for SHA-256 c514cc9eafd16a13…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 11:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7e4ffc8827c7feb9a34065400e3977d SHA-1: 04cf4f8ec653160c6feb5130f55b43eb3727363a SHA-256: c514cc9eafd16a131c0e22ed8d6adbae2dbfe0493c503cb6647dd06e625af333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=english+grammar+exercises+for+class+11+pdf PDF link annotation
    • https://photojet.bg/userfiles/file/66682353738.pdfIn PDF document text
    • http://adveotec.com/img/file/vuduregijaterabigi.pdfIn PDF document text
    • https://empresa-venta.hr/files/66508236592.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/668a82b70673dfb389b3a48b91883e2a/44627107021.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/bcb27a5da61056049d7467137e1f61ea/53787282111.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2031041614---58168050603.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/jusiredokalasa.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c655160ec56---juluwev.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/362vvr87h0r5mjvioaa2loselp/tubaninazakuvubebu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882eace3a42---52324764750.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210725132439.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/mewagikanepurofi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/86519651563.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/nafow.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/29309178502.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/tarifapapakimo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e56e112d6---43081563161.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-14/20210714130000416920.pdfIn PDF document text
    • http://dgjst.com/upfile/file/juwujog.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t2o5jnk4jtfkskmdk8qsfr197a/faxanexewaxafuk.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/lta2stf7v72oequribsraek08v/pukixetadutevuzonoke.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128de0f979bb---89969666938.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4591f07d2---51811658943.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_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 11108 bytes
SHA-256: f9bea59ed4ff9e278f495ebf9b35d6deebb7400ef668858cd334116618648de3
font_01_sfnt_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 18736 bytes
SHA-256: 116f64e5a53790c59554714463a26da856b983ca1ff3b65aec60c6c2f5cb3a2d

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