Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1c3e87a6a7f0aa…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 10:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f94752ebd3d39616910746d3004a4a5d SHA-1: fff69c0ac52589c8b3b869417a1268d91cccb6b5 SHA-256: bb1c3e87a6a7f0aa338c41e868efe51cc01eb5b1b2a9a4a97af5bd27c4d0c3d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=bootstrap+to+tailwind PDF link annotation
    • https://fullprotec.com/ckfinder/userfiles/files/43138226047.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/woferigavonaw.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/wopexetan.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16153e7d12a5a8---17927044355.pdfIn PDF document text
    • https://renewone.de/files/sugoramasejivefepu.pdfIn PDF document text
    • https://ntc-container.com/upload/files/junuwiralazukefew.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1932fcd9---gafabozuwezoza.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/tekit.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/tituxekelivejosasunuweju.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/6394604903.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0ukbo7qd9oc6788flk9dnh5e7m/39811670359.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/tevir.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/72781831789.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/80440446631.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/43241483929.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/73774797327.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/nidomo.pdfIn PDF document text
    • http://e-sportis.com/images/upload/63630221527.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/36536824565.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/vulav.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/30582849000.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/3429721682.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/favotidewuwarided.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7605bac1bfc439407569166083b6f71b/49698331114.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/67359880533.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/88776346701.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_off0000b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 10392 bytes
SHA-256: 3256cd597ab954680a1d405fb0d433d0e81b56c497d7564a4a4f0016f04f94a4
font_01_sfnt_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 15896 bytes
SHA-256: 5cbbcff095e1d49a71893ac103eded69010c6278da946230798ae46c23c7e393