Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec4df565b058d9f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 17:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e051a2e28e411f025b6968fa5658cfdc SHA-1: 4ef177b67a94c872812efb7a9cd4221c61c05d52 SHA-256: dec4df565b058d9f6383033346305a4380f30a54b4b02062cd1b7ab1eea3ea8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=biostar+2+manual+pdf PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884ff94369d---66705970912.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/duwebekoleniwefumid.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/50993ddb7f0f93568ab56d9007f69023/15908988673.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/61534760924.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/77189983276.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/luvasefenewukisukewew.pdfIn PDF document text
    • http://www.infos-lentilles-de-contact.com/images-sites/files/medivaxalibivelu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6dd2f1c0---43198541126.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bekowafakababewaluluref.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/40691847357.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/41770283081.pdfIn PDF document text
    • http://falerisztika.hu/tmp/97296155287.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/00cf509ee0f388ef144d6e08a1181eb2/75857166817.pdfIn PDF document text
    • https://signika.pl/Upload/file/94265276867.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/depudurubuvefiramoweruzux.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16279269021043796589.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffd1435e27---tizexeguwibizinatagabu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f7cce64---wufulurulutixeru.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/56087925104.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/45776876890.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xigamijikepubajem.pdfIn PDF document text
    • http://rem-proekt.com/f/file/momaxebefasugotisuv.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/toboxadugidojiduloxetaju.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_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 16824 bytes
SHA-256: ae73f28cb8c4679d657ccbfe9e2b2db97b7c1b70370c7a43cee70fa09bf08bd1
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 10800 bytes
SHA-256: 1185ca5dbb64abdf9a1ff5221a0a62c43f866155e833aaffb573a76057683936
font_02_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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