Malicious PDF — malware analysis report

Static analysis result for SHA-256 35792b2f7d902765…

MALICIOUS

PDF

82.1 KB Created: 2021-06-30 02:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e5d6e0c2827d952486d1144aa17f1a3 SHA-1: fb7a8bff38322ce76a390429044823ba8cd7cd04 SHA-256: 35792b2f7d902765de245c4763ab453377fe78d0f7540c7b488def369e1e9bf1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ceef0172---86739063058.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/mutakigisevizobu.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/rugarezazanobo.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/55489408206.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607938e70d43f---95492717149.pdf
    • http://cedule-plachty.cz/files/file/3913279947.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f52237f9a959bc4e647e4289d9bc6636/34368578231.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb89a510e---48009583486.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d415d238---81764925422.pdf
    • http://arcenevents.nl/site/upload/files/16188039236.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0203bbd1d3---buguk.pdf
    • http://feldbach-tourismus.at/files/85814838755.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0c6280cd---valapesipamazazotenejiv.pdf
    • http://ciskmv.com/css/file/wazitakimidobofabedab.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d0c10871---nejolonuzegubajum.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/20660507034.pdf
    • http://caratow.nl/userfiles/file/20420909661.pdf
    • http://zeroseistudio.eu/userfiles/files/2993158401.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/43325476416.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a04071f82---juxedomosafogisafosukija.pdf
    • http://csc-0411.com/userfiles/file/20210630060337_1p142a.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/70unvsnqtgbvd74qhjggmlknrl/wojelodamawo.pdf
    • https://a2designbg.com/userfiles/file/55414083515.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/utj1enjrpsc9sdj5pv056gouis/tapatobapupedekizobojadi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=convert+picture+to+text+arabic
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 16792 bytes
font_01_sfnt_off0000f036.bin
c871c5f9f9c74a3b983b5b9fc61de8d2f22f2e83d472af377022233ebca5e5dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 10592 bytes
font_02_sfnt_off0001085d.bin
94fd7bc440618fd72de251835ef5545e17d93cdbd312b6f6c9820e44da26e52a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 19724 bytes