Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9cf5726ecb0219…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 14:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e818097b83704a30099cef014e98c4ab SHA-1: e0864c085fa6ac82be3366f6eed70fa47ab1e417 SHA-256: bc9cf5726ecb0219f6f11af8a4002905d874d8b4516a77b1e18a729d065c833d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cdmatik.com/uploads/file/50305918822.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a6debbb4---fulujikuromokonax.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/70104936292.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/rinesejapu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72ffb49ee---ramowovakibijitewu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607981a88cbfb---jediz.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/fagid.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/86891204718.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/mitikutexinepezosiperu.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/13468325e8008fc864e33e7fcc8c14f5/21770296257.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/19612259128.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161090641614ef---2185801668.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/xumolidoxedojema.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba1d12cb3---71383639461.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210617_6B1ED9906248341B.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e64bdbf12---33323372504.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/fokegos.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b959cb8005d8673911067e6ec18bfd94/jarofuwebidu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160834d9042805---3173703849.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/jewazosabovuwijapavobuv.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503152936440520.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/26959927250.pdfIn PDF document text
    • https://designclarf.it/file/1535691115.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087db564f4d0---70695221369.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/69285008859.pdfIn PDF document text
    • http://toroisg.com/public/images/files/59190521591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=strategic+cost+management+and+performance+evaluation+notes+pdfPDF 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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 18504 bytes
SHA-256: f157d87bca832fd690d826f7c34229e43343ff55a004fa735b37026e5bdc1517
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 11204 bytes
SHA-256: 9980c38544a254e36c3d2e39fe5d7ba95c8537a961f349d75c4f1d8511d705fd