Malicious PDF — malware analysis report

Static analysis result for SHA-256 627c92bc77cf5a02…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 13:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7d6639d392c21dffdd57bda909e037c SHA-1: 4903d9d89df8faaac672c66b79d0a945f9867c1f SHA-256: 627c92bc77cf5a025dad740c8f5742b82d46258f9c8a1827096d629a55c63bc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm designed to obscure the ultimate destination, which is likely a malicious payload or phishing page. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d47ce879---belijapumopakujit.pdf In PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/wigixifetit.pdfIn PDF document text
    • https://rafautama.com/uploads/file/21183078271.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/boduwagevepisipitadap.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nabil.pdfIn PDF document text
    • http://steklo-shik.ru/userfiles/file/senazemozebif.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/buvamot.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/vusuzebatetotanosel.pdfIn PDF document text
    • https://777mto.info/contents/files/jemet.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079594317881---pagajojubed.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/lolanegedixuvosagev.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/48800584732.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/xibukanikewanugosenirifum.pdfIn PDF document text
    • http://www.bash.cl/media/file/gumubaxawoxabuvijoz.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d936483058---94055301949.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abec04c880a.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d115182c4---51884653196.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/86514535486.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kujituforu.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/60341301142.pdfIn PDF document text
    • http://inistor.com/ufiles/files/jowewovovaripadil.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a490c02acb9fc103f9d01bfda4997940/vewezakotebuwewipuwoduj.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/46095281378.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29953479420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=oenothera+rosea+pdfPDF 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_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 20152 bytes
SHA-256: 502f1c08ab3026d3edce72984bfd5da9aef8aba903ddad14de73410683e7b8b7
font_02_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 10484 bytes
SHA-256: 0df5665a899288a82c186190068a21f3645b6e4188b70e7d18383de907695e20

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