Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6decff92dff01c8…

MALICIOUS

PDF

120.2 KB Created: 2021-06-27 00:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 591220bf4c9f29c95e81f8f54c418a9b SHA-1: aa7fc691daeee0d707892705c8dec7fb83ede694 SHA-256: d6decff92dff01c823d052bcf0ea20c976aaa068568ac4591b3d2f1d5541cc96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains numerous links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and compromised CMS upload links strongly suggests the intent is to lead the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098748cb4f1f---wunefanawa.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409318b38f---6807804639.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b23708e839a---66472880380.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/mojowepik.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609852f7b637d---82438238071.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/wiguli.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/lezeg.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2c064b9d2---binubitozexobat.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/wadivikabidiwa.pdfIn PDF document text
    • http://schokozentrale.de/idata/37096876631.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ee921e6d---40201785283.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623106461.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210623110228857072787.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rj86drp839esud8nj5hokjtoc0/libofuwugobugugegu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a63505437dd---fejarewubijenaki.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c989742885d---bivune.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/werebulugonetopafigolot.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/76335666042.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/37863825450.pdfIn PDF document text
    • http://e-district.org/userfiles/file/16414165629.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/da0e1afaa9154bed9bb51c9fa3b5867b/27370258107.pdfIn PDF document text
    • http://capital96.com/userfiles/file/rabiginifowelagiwer.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af180ca2ba4---58687166039.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ceb91853a---guzerifiwovusuwisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reactive+bronchial+cells+cytologyPDF 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_off000174c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C5 10876 bytes
SHA-256: 36e3c261377890ed5389d47df9bbb4e74ee12a4c8301ff4fa9ced9fa9aae0ec9
font_01_sfnt_off00018de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5F4 17264 bytes
SHA-256: 47f4377df01cb98607c8456b6a10e009f1855c545601c6b34efd2fee6b775d96

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