Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e24675cb123e871…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 20:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77a70cc71f8318dfdc0065a362c65c1d SHA-1: aa7f2b0114c6c469f1e8ba1caafb1f65900ded47 SHA-256: 4e24675cb123e87112989ac09a069576a6298ff3a9731939a46f7d8747b64d56
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely for SEO poisoning or to host phishing content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of disposable hosting and UTM parameters for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/paromob.pdf In PDF document text
    • http://constantcontinuity.com/membership/data//files/lozitotidobar.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/71788408138.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/fegavikikumeraguxigekena.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8b1667b3---79992240845.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d01d0dd7---24385745242.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ng1dspbkon3nr99bjcs7v8sdc6/86857627716.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/86053606011.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078868f8a3ec---xunonun.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/woliwe.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/64239748501.pdfIn PDF document text
    • http://kme-kme.cz/files/file/48375977231.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8c97531d6---40583084734.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/mozedasixuz.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/81675002704.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/rugomev.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/dizalazexalusapofamuxol.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210715235908.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fa99cd59b01fb61a1c371fa597798cf2/55084327403.pdfIn PDF document text
    • http://cissi.it/userfiles/files/51928994470.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c4575f84d998bde253d6848d4fe86358/kexirotomufobi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072308022151.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9a982a4ab---24018580252.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bbb4c0aa1765a03f738b26d2bf18c935/zadijiwuvo.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/98944553108.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/vudevasawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=jurnal+budidaya+tanaman+kelapa+sawit+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_off0000c53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53A 17500 bytes
SHA-256: 35ec6609ef2fa7b6153bdc06516879548f825646126f731fef7edf6185d0fbaf
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 11064 bytes
SHA-256: 4944ed236b272956b525f3b612bcb3fd77af36e73ff27b6737d07519e505c875
font_02_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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