Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a6d9dfa52a1aae…

MALICIOUS

PDF

121.2 KB Created: 2021-09-17 11:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 85e73ff9de42da81ca29cf9291a4e85f SHA-1: 207a7a93d59d45f025a0b68af2a985763c0fa4e5 SHA-256: 51a6d9dfa52a1aae21eeaa04c642597808394edd7c13cda29bd383014fd5a7fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b614ab98---gemujamavonope.pdf In PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/rofuxifexirozosefolu.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/70512303442.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/36798848068.pdfIn PDF document text
    • http://lejonhund.com/upload/54646589839.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/59481188130.pdfIn PDF document text
    • http://sentralperdana.com/file/dufusogibat.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/dakerubijanezike.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/14023437636.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7c34187236ab1be90754b74b4200bbfe/jelidimisi.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/numuxamoribemolaxejonebun.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/4235526171.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/sirozurukawezebodokilij.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/75579724529.pdfIn PDF document text
    • http://17njl.com/userfiles/files/ximos.pdfIn PDF document text
    • https://kimcert.net/E/file/83341938854.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rekobosifovepi.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/farasidajonipasinew.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/vosexusuvabezibafep.pdfIn PDF document text
    • http://4rrecycle.com/files/file/ruguvebeb.pdfIn PDF document text
    • http://sial.pl/galeria/file/66289584364.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/jexijipevajidofokukav.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210906_034439.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431d7c462e8---70831699223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=up+in+smoke+full+movie+downloadPDF 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_off00017344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17344 10812 bytes
SHA-256: 92c1d089b0bd9b4b302917731760fc5343edddf257a4e507ac2e444d4a6bacf9
font_01_sfnt_off00018c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C37 19408 bytes
SHA-256: d8ae865d685d7f72cdfcf683429ca77e57132bc6654139d99e03d452b3548c87
font_02_sfnt_off0001be9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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