Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f4e4cd5316fe33…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 17:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f0c5cdda312810f0457235ee21fa191 SHA-1: 01d88fe256c6f8322101285a2b58caf7d06513fc SHA-256: 55f4e4cd5316fe337bf064fdaa933fca65f420cb8b408d9d140fe342d75dce14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to domains identified as disposable hosting or potentially compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://norrlandet.se/userfiles/file/povubade.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e992bb14---34752815066.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jusosuv.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b7c2eed78b6021ad879c0f0fa0bf8de4/44904544252.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bafasajed.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/wuveninoxeguzekuroxet.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/880f46735c74345bda0e37041fdc39a2/91157018769.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a418ca58886---1256980241.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/25863274268.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/nofiredamoponiludupimaze.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/paginudidifidukabikalutu.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/86287813716.pdfIn PDF document text
    • http://poultech.net/d/files/20802189635.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a4c28fjfljait9hm12fl7cfsd7/53917320515.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/46468770990.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n0775vvctj0g35bq4pnmtil2ck/57356401656.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/82209055508.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/xuzobibutawadurasoku.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/gamivatulosezujimul.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d7627a238---pimarosororeguxade.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832651bb125---50723160324.pdfIn PDF document text
    • https://medtek.vn/storage/file/tikizi.pdfIn PDF document text
    • http://bruntpratcher.com/clients/4/41/419cf983043b9371e8393ecf97d676f7/File/tudoxonunuke.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/lalinas.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/jidobukunanikavazow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=thank+you+for+the+fast+replyPDF 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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 10632 bytes
SHA-256: cc30520e0ad73407edb7c6196776e752d2093a9d487b64f897b0d13f800e4448
font_01_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 16956 bytes
SHA-256: 05a152c91263509b7fd851da97e6f092a0df23eb1a284dd26c57e19e16246d4f
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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