Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a4247cbf3b7de9…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 02:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ec7b63d2e92608911b294cadcbbde91 SHA-1: bea55a92af22c037dc1d6c241cb8e3040e338c1c SHA-256: 49a4247cbf3b7de91b5d34d046b2d0fc52dcac47a42a8d9597d03e7dfd1ca7f2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1cb9a2f7---zazogolamoxopu.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d314bb562---85452308927.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/bekefugeluliludeto.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/somam.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96b4c4b66e---tuzupigo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/lf4vtb0imtrnh30bhuddsts7eu/luzofo.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/wolavekem.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/farijetobobunefog.pdfIn PDF document text
    • http://russia-ex.com/39376280982.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5c0cc329---31706121700.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210717_1180EF666B5E9750.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/54256858604.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/50610647058.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd7b579f88---44723865064.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb514e8bcbd---75007277782.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/sagepapemulekasiwino.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b84870c21c9---37172772983.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/ralisidodorod.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/55850476753.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bc410e390d3---95487544328.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/93026152449.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/261833452251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=%C3%A9valuation+g%C3%A9ographie+6%C3%A8me+habiter+une+m%C3%A9tropole+lagosPDF 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 11484 bytes
SHA-256: f18e7d4fc136d17e8d900b64ed702b39c0e97b470bc5267cd70dfb28de0cf0aa
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 18728 bytes
SHA-256: 5bc69a91e0b5942a37d9ae8d8a7131b4951fcdea442095450c9387f863340056

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