Malicious PDF — malware analysis report

Static analysis result for SHA-256 942c01d3a437ce75…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 01:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 339f1ab346bc683262eea3bb2f9180d3 SHA-1: 47d1c04006f1b5c965299e75f22197d88c4cb271 SHA-256: 942c01d3a437ce752c41cc60617411ec501109f218cd64402e2cc170a77cd4a8
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggests a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The file likely serves as a lure to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=ford+fiesta+owners+manual+2005 PDF link annotation
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jlf7knooto4uh3m8log6vbisig/17345851334.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16097740f2bdbf---nalekagetugisovamu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/pufoneduvanixebif.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740901a12d6---72709522177.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/2242281427.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/pivabixumeg.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b891060ae---29786049516.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ht2t68f9n1fubm7j82qfqg6qf5/walisevepamiketobakas.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d0e3b90f---32034632.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c71466b31e4---feromosezimonetidixazogi.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7f3bc24ccbb8bf08379b1c13c0bbdb89/48953942525.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/69980859219.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/69528515595.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071120d5fc1d---kimogeg.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/pelinovudowonesanikid.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad0387d4f---romizeguxilizutorirosim.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca699528e24---84684082703.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072778b76a4d---nivoruzeviboxi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd555e7460d---tukobanodo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3e79e3dc0---xenibupavad.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2a37760af8dbce8a2e8dea9378b2eb99/66511170904.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8vscknihls1ntquv3ubatpmck4/pamagakivajugi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e9fa5256---6436466518.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a2bcfa965d4464efe923f4d2caba04ae/87016882924.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/bewunimopoxokibilopagadux.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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 11056 bytes
SHA-256: 078501e8bd7941b3b52a430d8e87d3041f0ea04911989baeadb9b968bbd58b2f
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 17224 bytes
SHA-256: 8a82b3acb71e6a461f83cba4eccdc8452e339f6e744d49dc1a2a2762c98d2143

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