Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a87980444fff47…

MALICIOUS

PDF

85.5 KB Created: 2021-08-09 13:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f537d63588ef8c163da59c65c6431453 SHA-1: 20e6b69906f8c2ce979c13bf52b5d37f175dbb53 SHA-256: 64a87980444fff47e8790100639a3fccc3f96258409ae714d0d04f0f3b352e6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous external URLs pointing to potentially compromised websites or malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in a link-based attack campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=what+type+of+bonds+do+molecular+compounds+have PDF link annotation
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/dilivota.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/getisit.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d91eaa9c---jorog.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28767219533.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/20640751544.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ddpjl3v60c7pf9nj783to7o9uv/63792700712.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/15727722511.pdfIn PDF document text
    • https://blogsma.com/files/80582985966.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/vajevilazivirenozix.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kepebebadujopavavofimode.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/norusonoduruze.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/wivaguwoloperofijaxalanag.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/68307884853.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1610914ff0432e---55463714193.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4156ba263d97c6a089ab0e83d1d2f2e8/pukadirivujexut.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/92021586319.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/tuxetarimakufetevabak.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef84d66b73---jejokarixarifawusabupug.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/10020354543.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/telewurumagasefinokivir.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ck6ejfod71gp32tmd7vepn54m0/3700354178.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757bb97fc4d---25869467599.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c46f0e84fb2587ca1af2bd96bf2c8d75/vipowifotaxexujalezan.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e3c902dc5f4c84114ef1af7f7934caac/47953063463.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/visarezodenan.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9e3386ba---wakepaziwigep.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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 11204 bytes
SHA-256: f219feb78c0dcd6adffb50ef77e93b59bb085d05e317dc395317caeaf9f4f118
font_02_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 16920 bytes
SHA-256: 9ec0876ea54ff8a64307eccf188fdfcce6d0efe64db53feba176cb39655b5225

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