Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cfd597efde5359…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 18:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36f3444b1337cb5670caba2f058fffec SHA-1: 36c6ac82f288380f1b4c88f2e3fb275327751941 SHA-256: b8cfd597efde5359741e06bfacbbf735b9370add27dbd544fba9d5e35f72db4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous links and the overall detection profile indicate a likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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=national+geographic+colliding+continents+worksheet PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c083426a---8989724716.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe561473e---96784616922.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1df69e3ff6---wigigigake.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/64hg6vdlnnhr7b8h2tmkdltsce/24522327536.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b58230e55e89e01fd6401c1a039dd067/piralujanivigivinefo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae6226ecb---93687311711.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a70f25b81---58864595954.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/47499906332bba1e52805779b35482fb/72621691488.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6bfd2491b---fumudenuti.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16208004185361.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/legifefotip.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///37815370956.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/jgdnn80ip952rfq23ledhgni17/36345000134.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc014831c---22804251376.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78a0bf606---jigadu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/kiremitejoz.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/09d850ef6d47e65f0a5b90283501250a/53361632331.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1951f3e325c2974730558545d51d327c/59602211837.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/majogepidupizixuwakese.pdfIn PDF document text
    • https://egf.tw/test2/images/file/28955642683.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/61527053929.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608059fadc5c7---66705398624.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 17180 bytes
SHA-256: e55f2b46db426b3a82516e28dd5b803385fd9cfe7cb391b7e4af691b8d3577fd
font_01_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00014830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14830 10948 bytes
SHA-256: 5567a93049264f9eda1e44aced79bc60410c6955b2b5a847bd2f7c4768748c94

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