Malicious PDF — malware analysis report

Static analysis result for SHA-256 f787e00bb74ecea4…

MALICIOUS

PDF

90.7 KB Created: 2021-08-21 15:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed77d5be959cf8000e7c7966a047dc12 SHA-1: 1591dbfcb8fcecb8efe5d7f16da38cd130be8d46 SHA-256: f787e00bb74ecea4136beed3d1ee25fc5434d0e7086490d6c3726263761cd8d2
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malicious content delivery mechanism. Several URLs point to compromised WordPress sites, suggesting an attempt to leverage legitimate infrastructure for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8503cb3b0---25691868670.pdf In PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/42363660263.pdfIn PDF document text
    • http://husplaza.hu/editor_up/97084418664.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/e2lg35tg7vc2pnudgi1u40venf/85921731304.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ce914b78bc7095f0a49618558a2427f0/mukoxeduzifinuvatosexa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b35c111e82f---92175843408.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/87358f2a30a62ed49bd1a14c3cb8dd66/danajunebaramafid.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/21915796479.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/cj5m1evr0p1ufqqv547egtn4m3/49942215536.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/kawidorumefoga.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/97456004782.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/50884415380.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/papofekulobebagewemugot.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b76b1a00---2198453764.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d527df3be1d---wizamuperiturobulevuzov.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8f727608d0fa041e492805b95aa29835/4017883656.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e0730aea---tojumipoloxikorodoferimi.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/ladefafexubikujifebaxeti.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/454b723d326fef0b7671e2f45f897d03/65736236122.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/jijazerudexupamipen.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/75f1e4aa939bf571c1824db2e6bcae31/miburulaxesu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100efddd2c4c---50591207115.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fp99s3ac3dfbfa92u4m9ni3qs3/18589219682.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/42316242165.pdfIn PDF document text
    • http://sintaxisfacil.blogspot.com.esIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sintaxis+1+bachillerato+ejercicios+resueltosPDF 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_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 17104 bytes
SHA-256: 4e3ff1434697210eba13657e01ee61bd6a14891c1d923d7ee7a5866afb39d3d8
font_01_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 10924 bytes
SHA-256: 58ce1569d7a0cd1845a74ef070a02fefdfdb417bdcddd47a9758093ab4c40bba
font_02_sfnt_off000142c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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