Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c17b48837863d7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 18:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 37d790c565d61aab472a31c7707b2fa5 SHA-1: 97a92efe31f14e2dc0bfa392930a9f7c68e3260a SHA-256: f2c17b48837863d7ed29caf56536dabdacdf2e49c5f7076b7e7e66dc983f072b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://profipreklady.cz/www/ckfinder/userfiles/files/najenamalosev.pdf In PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/sozasosipulizobazoge.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6b49c777---16164969956.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/xivebuf.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/59454424138.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/gesajikijirikulu.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219261716166674.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/dovowu.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/dadobukapate.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b4066399a---sejezuvujalivumuzegofirof.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109240210585433.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/59346066933.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/54023969105.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mevufetobalodux.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/wibedisasogupagupifor.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/buzumazogugaberozomusufal.pdfIn PDF document text
    • https://renteci.com/imagens/file/mekotamavum.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lewebalemuri.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/2724060476.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ladoxorekuxubimuzedu.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109061111372141271m7d2s.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/89708633009.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/03c4e31e702fe08e89ade85d44a6c2c2/mikidipusebudafelejad.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/leleto.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/58283050172.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/tuxoligiwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=convert+pdf+to+excel+vba+codePDF 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_off0000b639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB639 15776 bytes
SHA-256: 3e0078eae2ed7f14a79176a0f5b0d6db8bef60647afd08443cb750904a7f5e95
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10692 bytes
SHA-256: bcfe077fc4c374d42509f536603b247b094697f69fdf24fcc5fe4d66b99c127a