Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e404150e239cd5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 10:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e83d26300e0b602d26c63bb0474121b8 SHA-1: a487c5ea94f99b7f4040f0c463890ebe185e0107 SHA-256: 20e404150e239cd52254c32b897c864617daa6112506764aed1ef1044d8c4111
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://sevenhillsgroup.net/ckfinder/userfiles/files/totuxewowuxute.pdf In PDF document text
    • https://sabresources.com/FCKuploads/file/rokejatopidigaduxeda.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/58689912000.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/fufejijapiliwimiwovusiwu.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/fitupetezeripawavif.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/lepenibejaroxirudem.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/51825209557.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca940978b0b228deae01363ca08fe5f1/37252068093.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/dulus.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140617306912---manodudixobomomewer.pdfIn PDF document text
    • https://noventa.cz/media/files/file/78427467113.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161417e163b1ac---zuzegosirogupubor.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/siviwazowugelix.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/fufejonisadajo.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/mapekepirex.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/41381680046.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/fotovatukugiru.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/51946584330.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/bawenolobaxulujojolevuz.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/15989554759.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/11310058986139865f72c14.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=storage+emulated+android+dataPDF 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10596 bytes
SHA-256: 272e08e546c75ce4b63d9b501152c4af50409df9cbc510cb275d183f350b4c9d
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 16420 bytes
SHA-256: 7634709b8437e2e6953e9d5b7d1c15b03ce7729f65a17b68123d78a34b111667