Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe4673e992aca41…

MALICIOUS

PDF

70.9 KB Created: 2021-08-30 18:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06d174e608250d4288c52516d3ac9123 SHA-1: bd74d095a6500b9b5bf667b2d31b697f9af81d13 SHA-256: cbe4673e992aca41ac3bf458572831a4c65513a2460e8e41ea60fb8c1e01c0a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. The heuristics indicate that the PDF acts as a link farm, with many links pointing to other PDF files hosted on compromised WordPress sites and disposable domains. The embedded JavaScript likely facilitates the redirection or download of these linked files, contributing to a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=another+word+for+seek PDF link annotation
    • https://askisan.com/upload/ckfinder/files/jumaxu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dewaruxumemuvetowewani.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/fitufulazobuvaber.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160906e7d1e092---ropunizi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599d2beba9---velexifokikuwuke.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/57462212773.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809fac21a9f---32672908123.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/nelolitot.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967f3ccc87f---kagido.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//valiwebinegovirurixuvu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcebc2b8b---74027608374.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/19687999006.pdfIn PDF document text
    • http://tochuchoinghi.org/files/bezinaxesevubotuzizadedus.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/zenuriso.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90339916915.pdfIn PDF document text
    • http://chenruichem.com/upload/files/topadetiz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cbbc37ea86e77b89abaede0566fe5e5b/vukiwerorelam.pdfIn PDF document text
    • http://vladekoservis.ru/files/tebuv.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/9200696606.pdfIn PDF document text
    • https://mojer.bg/files/17595119306.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/gebetusubop.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ccea2e674---41584628801.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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 10312 bytes
SHA-256: ddb7591cd4b717e1b7ded595c8bf5b4359e32c7e8e79770d46006da92fd7e84c
font_01_sfnt_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 16100 bytes
SHA-256: 39db5052ef82796306f78a1c1f35d7166d9e6268f41f369cfcbf0d9dc5e00c8f

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