Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1577bde7d4fc5a6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff8d0f9344044f0414019ade5f703ee9 SHA-1: 2a31f5882760a50f66734e7a73e63a7f482b706f SHA-256: b1577bde7d4fc5a6ee392f4afcd1be95da416ff77efabae1df764a711c808fd6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. These sites host further PDF files, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fed30ca41---raporaximifuvogenazad.pdf In PDF document text
    • https://kalitelivideoizle.com/resimler/files/bavibotuwex.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/db1e3c9cef53e0d2df33b7f094ac139a/43640065932.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c91755d93f74385f04251c7d153ac869/vozakinovapipitifokolimef.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rdtnv3d6k4dp6ivshu8gscag6c/26559573396.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/23630923442.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210906203154.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3bd844ca---nupojiv.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607920037760c---mafopu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d7d78da1---taligipisorotokupevilifi.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/fuzezurumunudaw.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/76224997702.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210522162168317768.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/95ffb81b81efede156ab15bf2628adf5/sadatopuduxarovafokusobet.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108271625318806.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/53697215735.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ebb3e4b207c449dba9dc362da2bc4589/ruzinezelunadojixosixudaw.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/oudjplfu55fdd2rm9vc62k8ftb/53369376157.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a065b807d3f---27911329109.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161127adce410a---84562093506.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210726173820.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/rofesi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbb95bfa96---4243652642.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ledngckrdru8umdd0hamgke9gs/simozikabumibusef.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/76863809657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+word+converter+latest+version+free+downloadPDF 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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 19664 bytes
SHA-256: d6e817bfbafbcbbd35400c8b22ffd39291a016c88bfc610aba8e89d00d6b3cf8
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 10620 bytes
SHA-256: 07c0e6bd309b90642975f0b6f8cf9ef2d45f997cff600df73a86241ab6ca8b60