Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d59008a053916f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 02:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad4b3203f39a81d6670243244a5d6d12 SHA-1: 748e7c470d8fb0290e63c4dc8b1be56888930dfa SHA-256: a5d59008a053916fc4fe3a6f03bd89454683c41f6d324c2d02d530ed14846725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external resources, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=download+football+tv+live+apk PDF link annotation
    • http://divodizain.ru/ckfinder/userfiles/files/5483907319.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109101800467846.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/kogibunitena.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/22563291152.pdfIn PDF document text
    • https://equimat-cheval.fr/file/4065910712.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b40999e944a4e0ab419d0ac987ade2e2/repokotefos.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/rapas.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/xubivekuvuguzunadenereso.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/dabujatumuxujemir.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/berixijuxejox.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/46242912741.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/95399447951.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9bb584dc4---91672835096.pdfIn PDF document text
    • http://nature-revive.org/files/file/tevotalureti.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/lodusikumukubejexifok.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/18101317725.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133de576aba2---5333477177.pdfIn PDF document text
    • http://boki.hu/editor_up/69561783476.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/81195120637.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/zujowaxixojasejafixux.pdfIn PDF document text
    • https://projetovm.com/uploads/files/wokixuvubotoxusaluxozewi.pdfIn PDF document text
    • http://rld-carbon.ru/file/nifitudalinevibowafidaz.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/pefusimexorenedul.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fe61b0251dfe7167f481cd8c18f35612/96032856051.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/76216731245.pdfIn PDF document text
    • 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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 18040 bytes
SHA-256: 9ff42ee2a16311993379817a5cf87dccee961613bda4956793d0cdefe6b1a0a5
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10608 bytes
SHA-256: 979208d3cc489ed378d3b8aebae32b7b2304a35ca2e667d2c8d5a06e4aa436e0
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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