Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bb568330b903bf…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 14:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e0f304a8e35208008dfde36b9fe32ae SHA-1: e7c65e8a62361e8ee1880bc7040176589d896ab8 SHA-256: 18bb568330b903bfd8cec15651341be38ca4e38cfeed0b000426ab3a01ee1f5f
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 numerous PDF files hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://actybrain-consult.com/Upload/files/xadutowefofibakawalurog.pdf In PDF document text
    • https://bawwabatrizq.com/userfiles/file/64546828642.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/kexafukununivifajagaz.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/679b1b1de6121f43174fe588e688f8db/tuxanaju.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086265caf237---kajore.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/sotedadorotazesowajer.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160db760cbd65e---jasotufiwizezomav.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/sokotedivazetusekodoxadu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/901010050c00059cc019f3327341dba1/80350615800.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24162958c---57013677947.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/xikunuzipizorisupi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe623ebe2---bamobam.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/pupejagozagirapiga.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2352d10c---35446279507.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/98f4ef8eae6adbcab94f2b465aeca9f9/36064050845.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e56f6865f---bunikagijikugo.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/mejuxevofasositezitukojup.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/poloda.pdfIn PDF document text
    • https://norservis.com/files/files/74646763765.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/45264598003.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/ronitojipakipefasa.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/74020245542.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/jakojufonub.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/19731667296094187894ef5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=essex+term+dates+2019+pdfPDF 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_off0000b970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB970 16280 bytes
SHA-256: 96531dce736505d202dec6e97d915b120277f66e2ae606ed737b957752d8591b
font_01_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 10844 bytes
SHA-256: 85b04e21d030d80a79c0c5e46af3c089fe6caee2ce930b5fa5d8ce0d6b65aad0
font_02_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1