Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8971292468bf5f…

MALICIOUS

PDF

91.7 KB Created: 2021-09-04 11:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6bad2916a98b976de9a4cdfe58e5e6fa SHA-1: 71447422cae113c45d1e3713755ce8aae1702b71 SHA-256: de8971292468bf5f113cca8a8a2a9140fa48426327917f8e50df1cb7b792d757
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm on disposable or compromised hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7dd29ed10---92477281218.pdf In PDF document text
    • http://levne-pohary.cz/UserFiles/File/42635550356.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/kikejodepu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/50687767867.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/fetubupinudesij.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/zanagoreja.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/fobijoxetajepukela.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/68935351587.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/70863818441.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861188a8e5---97294008872.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/88121190921.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/xiluterajig.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/buxip.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tawufumutefegakom.pdfIn PDF document text
    • http://holzbau-napetschnig.at/24367754410.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b369a2974b9---39184523680.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/rebogevupixomopitorobuvib.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/18017538679.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/totobasubanujajudovopaw.pdfIn PDF document text
    • http://djapm.com/userfiles/file/30518825989.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/zasabomoz.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/ganamefidonuxa.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/81678063883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fracking+en+colombia+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_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 11368 bytes
SHA-256: 07f51638dd8047cbf22d9d712b170b76f5783d87b71cafbe338305e8b9fc528e
font_01_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 19072 bytes
SHA-256: b64b5660e1af4e402becb4510701a7b527d9f3e3efeeacdbdf724cf207f90048
font_02_sfnt_off000148e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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