Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcd6e6e3943ec2f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 20:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16e26929d9f52c403c5ff9ba76569eb7 SHA-1: 8eceeb611d757f621b6943d35f41a1413c1fd52c SHA-256: 9fcd6e6e3943ec2f2baa330392698c09e31a0ea6a85bb8b4acb6a047992348bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, 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 numerous embedded URLs, many pointing to potentially compromised CMS upload directories, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://montagnobozzone.it/userfiles/files/pavisupurusemot.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/24e98a34cac176287c5b66456ab74b94/nunibamamezuzagupijodo.pdfIn PDF document text
    • https://ijp2.com/contents/files/73706637038.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a071629257a---16221816303.pdfIn PDF document text
    • https://angkagenap.com/contents//files/8395592063.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/tuwobowa.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/24555977879.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/45071685562.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701eb5ac9b1---27258632539.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/g2nv8m0ghraqube7dflikhprg2/dixobafab.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/dowuzonamunogogafutamev.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/g2k4g20g0qlauvn7mg5f6pgvi0/97260324845.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cd50c57a1---ragogeragov.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/33471066583.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/87971232673.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/sezusifekorupajo.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/godotifobuxex.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8d04ec782---9851496941.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/31380287286.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/97492544012.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/63027994006.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5cc457bcb---fesan.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3297190dc---93138845865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=peerless+kitchen+faucet+manualPDF 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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10672 bytes
SHA-256: 632aba22d5e189bbce9212eeae89c253018a8ab0b816add71f1d9e4da118e7d2
font_02_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 17812 bytes
SHA-256: f6d5c0aa5ca2dca4a5cb2134dc8e9a6ef139b5546b5b8397492bc2cf44894de0

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