Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5b9d642bcbf3a0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 17:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4deb8673e8071fe0890fbf35f1f1ef7e SHA-1: 0d129ffc01db98a18ff876cce39650957f26d09f SHA-256: ca5b9d642bcbf3a0aa858b1a27e46ec70fd947b3b012eb43004bf0c256ae687a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The numerous extracted URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fields-on-earth.com/images/blog/file/gepoxajaselerawo.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9i304afk072491i5numc0s850t/betaduzafodaxizuf.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef191d2f2---rovutekuxina.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/78710054972.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cfbe412ff---numibemozifebolabinogi.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/51209305273.pdfIn PDF document text
    • https://derfo.info/resimler/files/zafofolawivixun.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/344613011.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/98121048571.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/p4a4550cjc9rac672ihcvv5tbv/xutexaxulurubu.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/sitosuripenab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e0b519756604d72d982b872462ea67c8/48816630779.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/10337764024.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/23817968250.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/fumabifudefinuvesininodof.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/22971838451.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/rizuranutojodiben.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/zexawunatupudawujapegifed.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/39536962937.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/9658343282.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106072127499049.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pusemi.pdfIn PDF document text
    • https://schmitz.cz/res/file/vimoso.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/23418650270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=loss+of+smell+is+due+toPDF 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_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 16896 bytes
SHA-256: 768b2457a642af36bcfc9d6d9d5ff4c402a6f628225469d87847c20225d2903f
font_01_sfnt_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 10204 bytes
SHA-256: f702203be32a0cc328751b32d7028d7d52b44d77314f825be1affe1ccb82aba7

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