Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af427f77ba3e054…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 06:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c02bcdb2856c883a9e0c3c11e1a55de4 SHA-1: 6467195cefdbb7b8c07e0a15ecd15cd791bd123c SHA-256: 7af427f77ba3e05499eb57659a9af00d87c4e092d4301ee018857f947a72f65b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=new+mms+to+download+messages PDF link annotation
    • http://sarljarry.com/userfiles/file/45426182128.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5bb92b1cb62e6a697799144ce44cf6eb/xifed.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613836f4f0849---xomoja.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb863e1e4---85672120676.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140daf7c5fab---potevufozatukisoguj.pdfIn PDF document text
    • http://mastervin.ru/files/file/zefowapomotute.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109110823372370.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/gabufaxabesuronuwawap.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/tusevowexebevekazero.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109081936354273.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/zuwazufawinefolix.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/tinaraj.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/kuxuter.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a962cb652a---gojokurufoxubawig.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/matibupafavibanetuz.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gimn8qo1cm8e4vguiinfvkphhn/55390469968.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/27552036983.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/25871953247.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/7319158248.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fevodubu.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/16988368840.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/fuzonanofotupi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/61539555770.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/dofegebufibibefuzetitot.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 10464 bytes
SHA-256: 9f8e33c9f93f1cfc40d22fa9123c259abf262b752819aeb26dfc459debfd0920
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 18012 bytes
SHA-256: 289a0caaa7c5a19661117286e4e0b656aca1621ca60f5980aa3a3c91b995a235
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1