Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7d669a8165a73…

MALICIOUS

PDF

89.6 KB Created: 2021-09-11 23:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed89d08b806bd2730367e5ad1b743c9d SHA-1: 72674d5e9ef72f10de81b0dc406514854f6dd2e1 SHA-256: c2b7d669a8165a7379dd2e97e69b363c825cf6c8b8288d2451009a8cd230c080
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple external links, some pointing to compromised CMS upload directories, indicates a malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is designed to phish users or distribute further malware. The embedded JavaScript likely facilitates these malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://termoformat.md/img/files/liwaredabarugivip.pdf In PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1acd35425d55100ec324b887afdf5102/97277823460.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/5083449861.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadd636d98---dufujalila.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/rolajut.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/jemujalovanizomapeborisu.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/zabazoguvanil.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/fuxalevurefobozet.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/muxiwupirumaj.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136462bc0c39---sidinodunowaxebuseduk.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/65577488117.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/58713096223.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/28675038125.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/47230935122.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/1075092903.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/gikajoxibifijezugeg.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/fipisolafa.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/60712353714.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399cdd1df1d---bagizajegemilazelez.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131902611095---sedaliwaxoxinas.pdfIn PDF document text
    • http://uchid.com/uploads/file/tafijevosekuxuwivob.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/govuboxoxiwif.pdfIn PDF document text
    • http://lse.hu/userfiles/file/64088593764.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/luralakusuniki.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/42008194338.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/gufosuxawake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+fix+the+problem+of+download+pending+in+play+storePDF 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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 11380 bytes
SHA-256: 8b8de906e1ba210d4a1d30e237a9757b257ac7ff050b3230ce3da11e440d2599
font_02_sfnt_off00012601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12601 19196 bytes
SHA-256: a4f3b25630ee14153dbc2d8a5dbd7b9e4adca3622949bf4d80bd8809aa247953

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