Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac58d2347a9a96eb…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 19:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bda409f5284e9132b0c5f04e2f44ff1e SHA-1: 21118c1e9ded07e9ddec32ca09a754d60c21cf96 SHA-256: ac58d2347a9a96eb193bf27cda2a8a97e5cdca1fc46be571d1d5c75e9d0e81e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The embedded URLs suggest an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/nekalifedagulumupupu.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mjt639v1vf5aviotvs6g6215c6/guzemivumafiwokujuru.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/13762562393.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/53226574783.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/98369723994.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/luseborimunatekiludiw.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1db1ca490a2b6427fa44786b43457081/feboritujuzovilizi.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/varopeguzoku.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/29529437946.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/14831443433.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/81239371941.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3e51150ba722045878bad3e65819d735/jenujusigogigirunagome.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/30702741488.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c2fe31ea---gufulaselajufuv.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/ratatebarunefitawoges.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429170835613542.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/add457da9db410148fda6e710a8571b9/3166250521.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/vekekefepopopifun.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/90307983319.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/88238176358.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608046f786309---21919801838.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160908faf55a71---roxategododagudevij.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/kakasariko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=longman+academic+reading+series+2+pdfPDF link annotation
    • 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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 10896 bytes
SHA-256: 647ba312fe81c8d94ef9e513b41319cd693df853bc63db0244abe11b08564554
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 17160 bytes
SHA-256: a1e81bb8003c968a60162e0f911097c5fd0351a0bbaa3cde1c10e2de14d48201

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