Malicious PDF — malware analysis report

Static analysis result for SHA-256 a559f43cfcb3f0e8…

MALICIOUS

PDF

104.9 KB Created: 2021-07-20 21:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c7bc63fe3c678dafdad43d506bb81ab6 SHA-1: c2bd69ced257b4bc85051e40a2a11a350f6de6d6 SHA-256: a559f43cfcb3f0e82412e6659c61367f0d7835f1b1c52c9eca4e283cad8c5dad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://meganimal.pt/site/upload/file/44698451775.pdf In PDF document text
    • http://biosite.ru/images/news/file/27404995959.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/valebos.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d6b4b1f6---52888693461.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9f7a1e35a50f2e101bac702701bba66e/7009990905.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c509bdc45f---50873914888.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tolemifotulaxonulo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa1131f02f---radita.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/88867968034.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d537d090186---43779104282.pdfIn PDF document text
    • https://manenshop.com/upload/files/64472994712.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/74178323448.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/abb4b0773654650d11b3df4a9191d522/51761915001.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/22576586514.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075234fc9fe1---25040814767.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a43c0238d---15415983750.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8042fda120cd278fbf0a0abd1b20ac15/zuwajikasoxobafojobinaped.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/vunos.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/97662216915.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/95323448408.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/woreragepamezudov.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/33625039470.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/77691210568.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/sasul.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7eqekvjcev7eh8v4vs8mct684/37749646625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=notice+of+assignment+of+debt+templatePDF 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_off00013af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF4 10980 bytes
SHA-256: 5e5efcf37ee9a48948f8b826b989e3efc7363ac5825cc5b349834e62139687ec
font_01_sfnt_off00015401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15401 16300 bytes
SHA-256: b9e5ed0c4ed5169aed3db3d29c1f3c3f7982a57cb3f7f34063170a4672f82719
font_02_sfnt_off00017df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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