Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8889cb1e09c513…

MALICIOUS

PDF

90.0 KB Created: 2021-07-06 23:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6b90beb2900661b550fdb6b7f1d78f1c SHA-1: ac2b0b7e4c20620227c92512008ff04f62605d6b SHA-256: ca8889cb1e09c5132aeb9e50855aad67d102f2c83061150f8ddb021c7be8f419
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable hosting. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=probability+sampling+and+non+probability+sampling+difference PDF link annotation
    • http://amadpich.com/userfiles/file/57076270247.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/isamlns7u32qsdehdi2m8pulqm/golikavopaf.pdfIn PDF document text
    • https://anjingliar.com/contents//files/84311575026.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/zoxavi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463295164f---58883168485.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1159b6bf5---waridegebeguri.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91792394158.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160797325dbfd7---6827469788.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0a0240b86---juwulikaguvob.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/53818485045.pdfIn PDF document text
    • https://red-adlay.com/upload/files/45349763951.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dca76cabe---madeponuseburob.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/73995593755.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/letizatikosipezimusesubax.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/kilosujupisanusimo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/62727f506850b523c73001a691672e99/xedilezetapiko.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6ou73mhi9068lt079sjfcv3ai6/94840880869.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b2210c631020746d25b5ca2dd3b32eb8/15808493451.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/1293986381.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fqmbvfrcigl9vdcrq5ir32dkqt/vuzupizafevunefove.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d216b3bf4---tuvabowokuvoxis.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/46775069485.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5422b85a4a6ee550d2efeb9857e88ffe/68720741956.pdfIn PDF document text
    • http://dzbnf.com/upload/file///24077133346.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_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 17312 bytes
SHA-256: 9d097de2757b4fb8a8953e211460e42d9534afb2ba0f2ebf5a80c3e2ae3fa6cb
font_02_sfnt_off00014072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14072 11220 bytes
SHA-256: e8eba9975b33a7e5b03b4c0de8b7b3e44b2172d19cd1bf642679f5ecc73a936a

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