Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caf05bf40ead5cb…

MALICIOUS

PDF

76.1 KB Created: 2021-08-02 09:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef39a16545b7391e3e2a67c1549c7fb0 SHA-1: d54d8fe1207a0a4ced266b91010b4041f0ac9e6e SHA-256: 1caf05bf40ead5cb4ba16ccd29b838d58d0c57bfa1a94d55156a5cbf89908233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=precalculus+mathematics+for+calculus+7th+edition+solution+manual PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d22c1c6be62---42248993572.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2dad2aa1d7b28024787102d416075650/pidajasegusibel.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/1983163077.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/95064338396.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/32746195089.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/doduduxinoviwepawuloxar.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/d409528aac17c6526fd57d65e07959ee/18036602298.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vcmg1rogm0ff6okpifll8n81bq/2954883542.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf33d589f---94281375287.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/ganugizojusumazuvowup.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5392842a72---forazetutenaf.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zoxed.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a83559165---fiwov.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/88289924515.pdfIn PDF document text
    • http://exima.kr/userData/board/file/wefitabiviku.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/31186625226.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e4618e09640---difaba.pdfIn PDF document text
    • http://waterreducer.cn/d/files/13846851973.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/602c3566ff4511a074bb66b28b1664ea/6282367085.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mmd51oe1ll18clp7gtgasn8tra/rilar.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6f60fe2fbb35af74b7499e5b01e19d11/13291080082.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a454b6c306c---pudapewonawurejezovum.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_off0000c555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC555 16528 bytes
SHA-256: 12fe6da05d6a83b4042813a627c27ac7444cb5d19b97976f0d2745d2eedffacb
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 10892 bytes
SHA-256: 86080385177182e6102ca9b0a9b9b7155596c39652c8ba01538eb45def216ea5
font_02_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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