Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8505cbdfecad164…

MALICIOUS

PDF

113.2 KB Created: 2021-09-05 10:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e2235424bf47126017f05eafab89190 SHA-1: df5c6c553061a36c7e8e5f56b7ef1808a8035b47 SHA-256: f8505cbdfecad1641829f3e8c08b7062409136c465d7eb6ec3ce54e8a722efd0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ff7176c1---53075537461.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//35637121686.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5297c7e894---57915960681.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ce72e0ae9---tilivog.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/38778970458.pdfIn PDF document text
    • http://www.bash.cl/media/file/milabinozolap.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/rudobifaw.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/49416184913.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74950b519---bunefidarapamozomagoka.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93434436d---6663160579.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///47645302268.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/sozalagevibirepokusoz.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/gomemiliwi.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/41480351037.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/mofuvivikamisiw.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f5f5aec16d0a3f5815d53e29cc8fab11/81783733703.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wugulenonutawugin.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108161503097862.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4e8716bf---fonaf.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8945c26e22---46104958225.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/85622121009.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/gonoziti.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60bdd7bf56---rewenodarola.pdfIn PDF document text
    • https://ayurmitra.com/files/file/mufokudakagevezitim.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/61314036641.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/velumeparonuvudozif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=managerial+statistics+keller+9th+edition+pdf+free+downloadPDF 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_off00014e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E66 20060 bytes
SHA-256: 9572642da6b2eb51979542e65643d4747679c7ac6507c6ddc8820e229d6f6f9a
font_01_sfnt_off00018380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18380 11236 bytes
SHA-256: 4bb2ff722eccb420d3b2ca4c59501c6550444ee281ad3000fc5862410813b472
font_02_sfnt_off00019dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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