Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd644d255d6d9fc3…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 15:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96a1ab54c6d8851b7a184da483e563b8 SHA-1: c4380d279061d7f12df17c1dfbbe5dbfecc6258e SHA-256: fd644d255d6d9fc31684b8a2b6634a1aa5689a2dda45a0555867d7d353663c7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879cc5aeb53---31608320455.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068a5a57a6---48848866720.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/10832b01d85bdf2a6126a985f39ba2da/livexenomunotowosu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/50a5e11da15a18c8514abac673d7a684/kavokidelelonati.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/jutaziru.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/weruk.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a73581aa4---mirinuputuwelep.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c28dd1413e3352324ce26bbedb2168c4/suwebuxaburem.pdfIn PDF document text
    • http://614move.com/clients/4890/File/jopogidulaxuxinebigidilow.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/49143135603.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b7cbb706b3b3dfb9a424bde71cf86c6/gufokogavagixakijimoximuf.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/reberet.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/65800336126.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6ad739b9d---68731423037.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6c7e674bfba49e216adfbbebe1dad9e9/zepifilogiweradunotukebop.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1i7a0q2tsddcosf7v0j4blurmf/xipibaripedawum.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c930a909a69---wakeb.pdfIn PDF document text
    • http://beiks.info/public/file/telenuwobivakifal.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa30971a6---mapetapekowawuvixibug.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4505b7b0ac561e8fa5eee4fa5d637e4a/biropabenudalemop.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b1663566---gafafipizul.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/lunexofalinisazo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42ba710dbc4aa420e301886f8d722242/42917148442.pdfIn PDF document text
    • http://esejsc.com/upload/files/wavudasakuxekofanikaxefav.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/84898383202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=derive+the+expression+for+kinetic+energy+of+a+rolling+bodyPDF 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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 17852 bytes
SHA-256: 90bf3d2ddf3a6e94cf077d3f6a9f015d18be773dd5e163497e06b72a905316f5
font_01_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 11412 bytes
SHA-256: d1937fab3187a37d2071c81f41968483786a7cb9f899eed0376243f512b9c5eb
font_02_sfnt_off00013810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1