Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4c14557f08f1ca…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cff98cbc23aba50e098191f577f4ff0 SHA-1: 55f9a2d152228fed8ae95e47fd4199a8fb7e93c3 SHA-256: bc4c14557f08f1ca8583fbea30f2d6416b274e0e0f04f800c635b9eae774e2df
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some pointing to compromised WordPress sites and others to raw IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=hello+kitty+mod+apk PDF link annotation
    • https://robert-zauer.cz/userfiles/file/25290845738.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/49904395666.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/48386323093.pdfPDF link annotation
    • http://pacemakerpressintl.com/uploads/assets/file/kuzuretelu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/87848685356.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/javetekerokuf.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355e0c6a7e2---37568911572.pdfIn PDF document text
    • http://www.moyekolodin.com/files/sepobipiteb.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/bajibixex.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5777ed4a899060e902212a262ea3e7f2/78055237483.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/toduvikasixigikotatupi.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebaruwebokugonovenelo.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/52402351290.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/36bqsel2bifl1jmrhdnsrva7c2/36257174190.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/rixiwupaved.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c840cb501493c01a628f392f4579d638/redelopurizaxomevi.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/lodoroniwadax.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/makikowol.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/xivalibisuxojavorozesade.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ligefoxepemodeseludale.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/vojawujagox.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/lafozelikejepudeduk.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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 10380 bytes
SHA-256: 26e8f985047deaf8e7487def12fd6eacac1a635f6ccd4a38e585c21b00b1f4e1
font_01_sfnt_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 16872 bytes
SHA-256: 53fc0cf3f95a9344147b8e24e04a9b7f945e9b0f7483064a9c634b3942e7eaa2

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