Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0fe5a5d6375cf6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 22:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fe8fdd0c5e7705e44c22b2e3e8ec818 SHA-1: 3d2d7231617f6189c316e6115bc1dfe2343b0252 SHA-256: bf0fe5a5d6375cf6a985c2685cd0a2e906beb1d8b6878783eb7c8c79c5b48fdf
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and a link farm suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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://mamtomchabahai.com/uploads/files/files/37540407723.pdf In PDF document text
    • http://didopack.com/files/10424607843.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/jatipanutazo.pdfIn PDF document text
    • https://penal-garazh.ru/files/getuponefoxozexi.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/migogibamanobajekezobufaj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bb632a82---80867669149.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/juzaw.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161438ef081912---vepinivadora.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/36912834542.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jk7sqomg4mah17v38vspg1ptkp/97621454425.pdfIn PDF document text
    • http://bluebossa.pl/files/file/fifogodomubizadu.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xilapesanesikuv.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/1242463191.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gibunesagizeka.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/88212bba256ceb802c5f4c98c04685ab/vuxezu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f8110965---41509746643.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/jewetosijesopabalesi.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/nazita.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/95061515654.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/45509625859.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/migokifovaderegoxuladeg.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/16/file/bukolilajuxubakokifi.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/fututevipiwegibedabisoma.pdfIn PDF document text
    • http://slsnn.ru/content/file/11727002185.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/tebibek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dream+league+cracked+apkPDF 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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 10468 bytes
SHA-256: f8712d77d8ef97500ad82d79801c7d8ddf92aaab5f93e66add2c9e5e67a340bd
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 17380 bytes
SHA-256: b9eb3cd6e90393209cf82690b6cccb3842ce4fe86df3275ec655b47937249830
font_02_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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