Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53ea32e6555d5a6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 03:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca61c37ea6e7c30eebd518137df5ae21 SHA-1: 1d7f9f8d6e733fdd92f6bc72d69104a3ad8cee0b SHA-256: d53ea32e6555d5a6364e52e449a65b717dcc92084e384838fc2c49fa8d8c9a05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS uploads suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://cameragiaminh.com/upload/files/xolikegidufetogaxo.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e146ffa42643d6e7987a237488f5a29e/tikibikijumipakukepa.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/lukigidanuxejugatobezidem.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50f8576ed---49388150863.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/15692366572.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090b95473c31---81646863000.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/83047897611.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/7725937915.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/debegilet.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021082907371473499.pdfIn PDF document text
    • http://atek-ent.com/upload/file/98279671150.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8ee3087fe0060bdb32f48f811651007c/newenozoxagofazu.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/96582152930.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/mosorurumu.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/vepipagigobemid.pdfIn PDF document text
    • http://amdind.com/userfiles/file/junofofowuwiridiri.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/fetesobaxomesukevavari.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8edeecda---wasibejizu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/829a92a0e99a4bee1d61e2f34781dd9f/mutigokalu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f85cb1a3d---57189911583.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6e34d660---60788820787.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2e2c04ef6e82aa9c6bb8cddbda271608/guwulibutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prolactin+levels+high+in+malesPDF 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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 18124 bytes
SHA-256: 506cfbad0483b95d15ee10ddc7be8cd9aea206f59dd0d101199aa732c673721a
font_01_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 10744 bytes
SHA-256: 73569f4702609969c0878f6cb253722250f914636c6eb80986ca667b01b1f9a4
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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