Malicious PDF — malware analysis report

Static analysis result for SHA-256 3553f247509784e0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 02:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c34dc2356bd3cff2e8c82388700b15cc SHA-1: eaf42079156e2e4b7ab2962ada0d704faa23dc7a SHA-256: 3553f247509784e0a96701d3a89a71b36bd07c4cf169fe2d0ea84c15c2379b56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the malicious activity by directing the user to these external resources.

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 https://wastran.ru/uplcv?utm_term=online+sms+receive+apk PDF link annotation
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/65813630043.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/37284986086.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/waxatabibegaxemolelojosav.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/migosadijekuza.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/14787780305.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/75097604032.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/lomuradikuz.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/sasijakojanaxewanotefemu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/mejewuwerigodusabosax.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d71781cc7---kawuvexitojefane.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9a22f960---jagofizasavirew.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/xuvon.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/34074009530.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/73426049435.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332a7c992dd---bamevajitukof.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/98032280904.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_039896173B9A670E.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/39800258421.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/54439183224.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/talalipojagob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c17e99610---77511542954.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/48175398710.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/44744491625.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/gukulufizejinivinuvulifam.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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 18888 bytes
SHA-256: bff476a7e059d8df23d89c0abb017bc6b7a5fb046bcd93d35e90a094b3c41bb4
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 10500 bytes
SHA-256: e3e2c163e001577f0cc6f44bfb33fae5d4b909e5c2a68e8f15f3eb98dbe589cb

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